Big Friend addition

Abacus level 1: How to Do the Big Friend Addition formula?

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Abacus Big Friend Addition Formula: Today welcome to the interesting part of Big Friend Addition Formula of Abacus Level 1.
If you have ever thought about doing mental calculations then you have come to the right place.
In this Big Friend Addition Formula of Abacus Levels blog, we will take you deep into Abacus Level 1 and explore and learn 9 techniques of Big Friend Addition Formula.
Whether you are a student, teacher or parent who wants your children to learn valuable skills, you can learn our full Abacus course free online and teach it to your children.
So let’s start this part of Big Friend Addition Formula…

Big Friend Addition
Big Friend Addition

Big Friend Addition : Formula Chart

Technique no. 1+ 9 = – 1 + 10
Technique no. 2+ 8= – 2 + 10
Technique no. 3+ 7= – 3 + 10
Technique no. 4+ 6= – 4+ 10
Technique no. 5+ 5 = – 5 + 10
Technique no. 6+ 4 = – 6 + 10
Technique no. 7+ 3 = – 7 + 10
Technique no. 8+ 2 = – 8 + 10
Technique no. 9+ 1 = – 9 + 10

Worksheet -1 Abacus Big Friend Addition +9 = – 1 + 10 【1D3R】

Abacus Big Friend Addition   + 9 = – 1 + 10

123456789101112131415
2
2
9		6
9
4		3
9
5		5
3
9		2
5
9		7
2
9		9
-3
9		9
9
1		4
-3
9		8
-2
9		1
9
1		1
2
9		1
3
9		3
-9
2		2
9
2
               
161718192021222324252627282930
3
9
1		4
5
9		3
6
9		2
7
9		8
9
1		8
-7
9		5
3
9		8
-2
9		4
9
6		7
2
9		2
6
9		7
9
-5		7
-6
9		2
5
9		3
9
-2
               
313233343536373839404142434445
1
9
9		2
9
9		3
9
8		4
9
7		5
1
9		2
2
9		1
1
9		6
3
9		9
9
1		5
1
-5		1
6
9		3
1
9		9
2
9		3
4
9		3
3
9
               

Worksheet -2 Abacus Big Friend Addition + 9 = – 1 + 10 【1D4R】

Abacus Big Friend Addition   + 9 = – 1 + 10

123456789101112131415
3
9
5
-7		4
5
9
-6		3
1
9
1		6
3
9
-3		9
9
1
-9		8
9
9
3		7
2
9
9		5
3
-7
9		3
6
-8
9		1
3
5
9		9
9
9
9		1
9
5
-1		5
-4
9
1		3
9
9
4		8
9
9
4
               
161718192021222324252627282930
4
6
4
9		6
9
-1
9		2
9
4
-1		7
8
-1
9		7
9
-4
9		4
5
9
5		2
8
4
9		9
9
9
4		5
-3
9
9		3
8
9
4		8
9
-3
1		1
6
9
-2		6
3
9
9		5
-2
9
3		1
8
9
-4
               
313233343536373839404142434445
8
9
-3
1		3
3
9
-4		6
9
-4
9		2
6
9
9		9
8
9
4		4
9
9
9		7
8
-2
9		8
8
9
5		5
-2
9
4		1
7
9
-3		7
8
-4
9		2
9
9
3		6
2
9
1		3
7
1
9		9
6
-4
9
               

Worksheet – 3 Abacus Big Friend Addition + 8 = – 2 + 10 【1D4R】

Abacus Big friend Addition   + 8 = – 1 + 10

123456789101112131415
4
8
5		6
2
8		2
8
6		7
8
-5		6
2
8		4
8
6		5
4
8		9
-7
8		8
8
3		7
8
4		2
8
2		1
2
8		2
8
3		2
8
6		2
8
7
               
161718192021222324252627282930
1
1
8		2
2
8		3
5
8		5
2
8		5
3
8		9
8
-6		4
8
-2		6
1
8		3
1
8		9
8
-5		8
1
8		2
1
8		9
8
2		3
6
8		8
8
-6
               
313233343536373839404142434445
2
8
8		1
3
8		7
8
3		2
2
8		2
6
7		4
4
8		4
8
8		7
8
-5		2
8
5		1
1
8		3
1
8		2
8
6		2
6
-8		1
6
-5		8
2
8
               

Worksheet – 4 Abacus Big Friend Addition + 8 = – 2 + 10 【1D4R】

Abacus Big friend Addition + 8 = – 2 + 10

123456789101112131415
8
8
-2
8		4
8
8
1		6
4
4
8		3
8
4
-1		3
7
4
8		8
7
-1
8		5
5
9
8		1
7
8
5		4
8
3
-2		7
8
2
8		9
8
-3
2		2
8
5
-1		3
2
-1
8		7
8
-1
8		4
7
1
8
               
161718192021222324252627282930
2
3
-1
8		9
8
5
3		5
-1
8
3		8
2
2
8		1
6
8
-3		6
-3
8
4		4
5
8
-3		8
-4
8
8		1
6
1
8		7
-3
8
8		3
4
8
-1		6
5
1
8		2
5
8
-1		9
8
-3
1		5
2
8
-1
               
313233343536373839404142434445
3
6
8
2		9
8
1
-2		2
8
1
2		8
8
2
8		6
-3
8
3		5
-2
8
4		4
3
8
-4		8
8
3
8		3
8
7
8		8
8
-3
8		5
2
8
-1		6
3
8
8		7
1
8
-3		9
8
-2
8		2
6
8
-2
               

Worksheet – 5 Abacus Big Friend Addition + 7 = – 3 + 10 【1D3R】

Abacus Big Friend Addition + 7 = – 3 + 10

123456789101112131415
4
7
2		5
3
7		6
3
7		7
2
7		9
7
3		3
6
7		3
7
3		8
7
2		9
7
-6		4
7
-8		2
6
7		4
7
2		3
7
3		5
3
7		2
1
7
               
161718192021222324252627282930
3
7
3		6
3
7		3
6
7		2
2
7		8
7
4		3
7
9		9
-1
7		3
7
2		3
7
8		4
7
3		8
1
7		5
4
7		9
7
-6		4
7
8		8
7
3
               
313233343536373839404142434445
3
7
7		1
3
7		2
6
7		3
7
3		1
2
7		8
7
-5		4
7
-1		4
4
7		6
-5
7		2
7
4		1
7
7		2
7
-7		4
5
-7		3
1
7		7
3
7
               

Worksheet – 6 Abacus Big Friend Addition + 7 = – 3 + 10 【1D4R】

Abacus Big Friend Addition   + 7 = – 3 + 10

Worksheet – 7 Abacus Big Friend Addition + 6 = – 4 + 10 【1D3R】

Abacus Big Friend Addition   + 6 = – 4 + 10

123456789101112131415
7
2
6		4
6
5		9
-5
6		3
6
6		1
3
6		2
8
4		4
6
3		9
-4
3		6
3
-5		9
6
1		4
5
6		5
4
6		3
1
6		2
2
6		7
2
6
               
161718192021222324252627282930
8
1
6		6
3
6		1
3
6		2
6
9		4
-3
9		3
6
6		4
5
6		1
8
6		4
6
1		3
1
6		2
7
6		3
6
6		2
2
6		7
2
6		1
3
6
               
313233343536373839404142434445
9
-5
6		4
6
5		7
2
6		5
4
6		4
5
6		5
3
-6		7
2
-6		5
-5
4		4
6
4		9
6
3		2
2
6		1
3
6		6
-2
6		1
2
6		5
5
6
               

Worksheet – 8 Abacus Big Friend Addition + 6 = – 4 + 10 【1D4R】

BIG FRIEND POSITIVE   + 6 = – 4 + 10

123456789101112131415
12
2
6
2		7
2
6
4		4
6
8
-3		4
6
3
3		6
3
6
-1		6
-2
6
9		1
8
6
-4		6
-4
7
6		4
6
9
6		4
6
4
6		9
6
4
6		9
6
-5
3		4
6
2
3		6
3
6
-3		9
6
-2
4
               
161718192021222324252627282930
4
6
4
2		2
2
6
6		4
6
5
3		5
5
4
6		9
1
4
6		6
3
-1
-7		7
2
6
4		4
6
8
-3		4
6
3
3		6
3
6
-1		6
-2
6
9		1
8
6
-4		6
-4
7
6		4
6
9
6		4
6
6
4
               
313233343536373839404142434445
9
6
4
6		18
1
6
2		29
6
7
8		65
4
6
-5		38
7
-5
6		30
4
-3
6		59
-5
6
7		4
6
8
8		73
9
2
6		58
7
-5
6		27
9
3
6		72
5
2
6		21
8
-5
6		85
4
6
-5		32
-2
4
6
               

Worksheet – 9 Abacus Big Friend Addition + 5 = – 5 + 10 【1D3R】

Abacus Big Friend Addition  + 5 = – 5 + 10

123456789101112131415
5
3
7		6
3
5		8
5
6		9
5
7		5
3
5		4
6
5		7
-2
5		5
5
5		2
2
5		3
5
-8		5
5
4		5
4
5		5
5
1		6
5
1		7
5
2
               
161718192021222324252627282930
8
5
1		9
5
-2		9
-1
5		8
-2
5		7
-2
5		4
5
5		9
-3
5		8
5
5		2
5
5		8
5
7		7
5
6		8
-2
5		3
3
5		8
-3
5		9
5
-3
               
313233343536373839404142434445
1
5
-5		5
4
-5		5
5
1		2
3
5		5
5
3		1
5
3		3
5
5		6
5
-1		4
3
5		5
5
4		4
4
5		1
2
5		15
4
-5		2
4
5		5
4
3
               

Worksheet – 10 Abacus Big Friend Addition + 5 = – 5 + 10 【1D4R】

Abacus Big Friend Addition  + 5 = – 5 + 10

123456789101112131415
3
6
-8
5		7
5
8
5		8
-7
6
5		7
8
5
6		5
4
9
5		6
3
5
7		2
7
5
8		9
5
7
6		5
5
7
-5		2
7
-5
-3		9
5
1
5		4
1
5
1		6
5
4
5		3
2
5
1		8
2
5
5
               
161718192021222324252627282930
5
5
9
1		2
3
5
1		7
4
4
5		1
7
5
2		7
5
4
-3		2
4
5
4		5
4
5
1		9
5
4
5		1
5
5
4		6
5
5
-4		8
-6
3
5		3
3
5
4		4
2
5
4		6
3
5
2		3
5
5
4
               
313233343536373839404142434445
8
1
5
1		4
3
5
3		7
-4
5
5		2
5
5
3		9
5
5
2		1
6
5
3		5
3
5
2		6
-2
5
5		2
6
5
3		9
-6
4
5		7
5
5
3		4
5
5
4		7
4
4
1		3
6
5
1		5
2
5
3
               

Worksheet – 11 Abacus Big Friend Addition + 4 = – 6 + 10 【1D3R】

Abacus Big Friend Addition   + 4 = – 6 + 10

123456789101112131415
3
6
4		5
3
4		8
1
4		7
-1
4		2
7
4		6
2
4		8
-1
4		7
4
8		1
7
4		9
-1
4		4
5
4		3
6
4		5
4
4		7
2
4		6
4
9
               
161718192021222324252627282930
2
7
4		4
6
7		9
-2
4		3
5
4		1
5
4		2
4
4		4
2
4		5
1
4		6
4
1		3
5
4		5
2
4		3
6
4		5
3
4		1
7
4		8
8
4
               
313233343536373839404142434445
5
3
4		8
1
4		7
-1
4		2
7
4		8
-2
4		8
9
4		3
5
4		9
4
-3		1
8
4		9
-1
4		6
4
5		3
3
4		2
4
4		1
5
4		3
4
4
               

Worksheet – 12 Abacus Big Friend Addition + 4 = – 6 + 10 【1D4R】

BIG FRIEND POSITIVE   + 4 = – 6 + 10

123456789101112131415
4
5
4
7		2
7
-3
4		7
2
4
8		8
-2
4
7		9
9
-8
4		7
4
6
-2		9
-4
3
4		3
6
-8
3		7
4
8
-6		2
2
8
5		3
6
4
4		6
-4
6
4		1
8
4
4		8
2
6
4		4
1
1
4
               
161718192021222324252627282930
9
1
6
4		2
3
1
4		7
4
4
-1		5
-1
5
4		6
-4
5
4		9
2
6
4		2
4
4
4		5
-4
7
4		7
2
4
2		1
6
4
4		3
3
4
3		8
4
4
4		4
4
4
-1		6
-3
5
4		4
1
2
4
               
313233343536373839404142434445
7
3
9
4		2
6
4
3		9
4
2
1		3
1
5
4		8
1
4
2		1
5
4
1		5
4
4
3		6
4
5
-3		1
4
4
4		8
4
4
-2		5
-4
8
4		3
2
1
4		7
4
4
1		2
3
3
4		9
-6
5
4
               

Worksheet – 13 Abacus Big Friend Addition + 3 = – 7 + 10 【1D3R】

Abacus Big Friend Addition   + 3= – 7 + 10

123456789101112131415
1
6
3		2
7
3		5
3
3		8
-1
3		9
3
-1		6
2
3		9
-1
3		7
3
5		7
2
3		8
3
2		2
5
3		4
5
3		2
7
3		9
3
9		8
7
3
               
161718192021222324252627282930
8
-3
5		3
6
7		3
5
3		2
2
-3		7
2
3		3
6
3		5
3
3		7
3
1		2
5
3		1
6
3		4
3
3		1
7
3		9
-1
3		2
6
3		2
7
3
               
313233343536373839404142434445
8
-1
3		9
3
-1		8
1
3		6
3
3		9
-3
-2		8
3
2		7
1
3		8
3
2		7
2
3		7
3
5		3
2
2		7
3
3		4
3
3		8
-1
3		6
2
3
               

Worksheet – 14 Abacus Big Friend Addition + 3 = – 7 + 10 【1D4R】

Abacus Big Friend Addition   + 3= – 7 + 10

123456789101112131415
8
8
3
7		3
5
-3
4		7
3
8
-6		6
9
4
-3		4
6
8
-7		2
7
3
-2		6
3
9
-5		4
-3
7
3		3
7
3
6		2
7
3
2		6
3
3
3		9
3
2
3		1
7
3
5		4
5
3
3		7
3
5
-1
               
161718192021222324252627282930
2
3
4
3		5
3
3
4		8
2
8
3		3
2
4
3		4
3
3
7		6
2
3
4		8
2
9
3		3
3
3
3		9
3
2
-1		2
4
3
3		7
3
1
4		1
8
3
3		5
4
3
3		4
4
3
-1		2
7
3
3
               
313233343536373839404142434445
7
3
5
-2		1
8
3
6		5
2
3
2		8
2
7
3		4
3
3
2		9
1
9
3		6
2
3
8		4
5
3
4		9
1
8
3		3
4
3
7		5
2
3
4		7
3
5
-3		1
4
4
3		6
2
3
6		2
7
3
4
               

Worksheet – 15 Abacus Big Friend Addition + 2 = – 8 + 10 【1D3R】

Abacus Big Friend Addition  + 2 = – 8 + 10

123456789101112131415
6
2
2		9
2
3		8
2
4		6
3
2		8
2
1		9
2
-1		9
2
2		9
-1
2		8
2
2		5
3
2		5
1
2		5
3
2		6
3
2		9
2
6		7
2
2
               
161718192021222324252627282930
8
9
2		5
4
2		8
2
7		2
6
2		4
-2
2		1
7
2		3
5
2		6
2
2		5
4
2		4
5
2		1
8
2		4
5
-2		2
7
2		3
6
2		8
2
2
               
313233343536373839404142434445
8
2
1		5
4
3		9
2
-1		6
3
2		9
2
3		8
2
7		1
7
2		6
2
2		9
2
3		2
7
3		8
2
8		7
1
2		6
3
2		1
7
2		5
3
2
               

Worksheet – 16 Abacus Big Friend Addition + 2 = – 8 + 10 【1D4R】

Abacus big friend Addition   + 2 = – 8 + 10

123456789101112131415
4
6
7
2		5
4
2
6		8
-2
5
7		7
2
-3
9		3
6
2
5		7
-2
4
-7		2
8
9
-6		6
3
-4
2		8
1
2
-1		7
2
-3
9		6
2
2
1		3
2
3
2		9
2
4
-1		2
3
3
2		4
4
2
1
               
161718192021222324252627282930
8
2
4
1		1
8
2
4		5
4
2
4		7
2
2
4		6
-1
4
2		8
2
4
2		2
3
4
2		5
4
2
8		1
4
3
2		3
2
4
2		9
2
4
-2		4
4
2
2		7
2
2
1		1
3
4
2		7
2
2
3
               
313233343536373839404142434445
4
4
2
6		9
2
4
-3		2
5
1
2		5
4
2
6		8
2
4
3		3
5
2
1		6
2
2
5		5
3
2
7		4
4
2
3		7
2
2
7		1
6
1
2		3
5
2
6		9
2
4
-4		2
6
2
1		6
2
2
8
               

Worksheet – 17 Abacus Big Friend Addition + 1 = – 9 + 10 【1D3R】

Abacus Big Friend Addition   +1 = – 9 + 10

123456789101112131415
9
1
3		9
1
5		9
1
8		5
4
1		9
1
1		2
7
1		3
6
1		4
5
1		9
1
7		1
9
4		9
1
4		8
1
-8		8
7
1		3
5
-1		6
3
1
               
161718192021222324252627282930
1
9
1		2
8
-1		3
5
-1		7
2
1		2
1
5		7
3
1		6
3
1		9
1
3		3
6
1		1
8
1		9
1
2		9
1
1		2
7
-1		4
5
1		9
1
9
               
313233343536373839404142434445
5
4
1		7
2
1		1
9
4		9
1
7		3
6
1		9
1
6		2
7
-5		9
1
5		5
4
-1		5
4
1		6
3
1		2
7
1		1
8
1		9
-4
1		8
-1
-2
               

Worksheet – 18 Abacus Big Friend Addition + 1 = – 9 + 10 【1D4R】

Abacus Big Friend addition   +1 = – 9 + 10

123456789101112131415
6
3
1
5		1
5
3
1		7
2
1
4		5
3
1
1		7
5
7
1		8
1
1
6		3
7
9
1		5
4
1
1		6
3
-1
-2		4
6
9
1		9
1
4
1		6
-2
5
1		1
8
1
3		3
2
4
1		8
1
1
1
               
161718192021222324252627282930
5
-1
5
1		2
7
1
2		7
2
1
9		7
2
1
1		5
-2
6
1		3
3
3
1		9
1
4
2		2
-1
8
1		6
3
1
4		1
5
3
1		4
2
3
1		8
1
1
2		4
3
2
1		8
-4
5
1		2
7
1
9
               
313233343536373839404142434445
1
4
4
1		6
-3
6
1		2
3
4
1		5
4
1
1		9
1
4
3		6
-4
7
1		3
5
1
1		8
-7
8
1		4
4
1
1		2
7
1
7		3
4
2
1		7
-4
6
1		4
4
1
1		2
7
1
7		5
-3
7
1
               

F & Q

Q.1. What is big friend addition ?

Q.2. Is Abacus big friend worksheets available here?

Q.3. What is an example of an abacus big friend addition?

Q.4. What is the big friend addition rule in math?

Conclusion

Abacus Level 1 Big friend Addition : Let’s Learn How to Do the 9 Techniques of Big Friend Addition opens the door to a world of mathematical excellence.
By mastering these techniques, you not only enhance your math skills but also boost your cognitive abilities.
Whether you’re a student aiming for mathematical proficiency or an adult seeking mental stimulation, Abacus Level 1 offers a rewarding journey of learning and self-improvement.
Start your adventure today and discover the magic of the abacus.

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