← Back to Resources/Mental Addition Sequences

TamilGenius Lab · tamilgeniuslab.com

தமிழ் ஜீனியஸ் லேப்

Mental Addition Sequences

Course: Mental Abacus Bridge

Practice Sheet · Premium

4 pages of mental addition without physical abacus. Hold, add, write the result. 40 problems.

Mental Bridge — Mental Addition Sequences

40 problems across 4 pages. The child holds a number in their mental abacus image, adds another number mentally, and writes the result. NO physical abacus allowed.

NO physical abacus for this drill.

The child must visualise the bead positions in their mind. If they cannot picture the beads, go back to Flash Visualization drills first.

Page 1 of 4 — Single-Digit + Single-Digit

Parent instruction

Say: “Picture {number} on your mental abacus. Now add {number}. What do you see?” Give them 5-10 seconds to visualise before they write.

1.Picture 2, add 3=

2.Picture 1, add 4=

3.Picture 3, add 2=

4.Picture 5, add 1=

5.Picture 4, add 3=

6.Picture 1, add 1=

7.Picture 2, add 2=

8.Picture 3, add 1=

9.Picture 6, add 2=

10.Picture 5, add 4=

Page 2 of 4 — Using Complement Rules Mentally

Parent instruction

These problems require 5-complement rules. The child must visualise the upper bead swap in their mind. If they hesitate more than 15 seconds, note it and move on.

11.Picture 4, add 3=

12.Picture 3, add 4=

13.Picture 4, add 4=

14.Picture 2, add 4=

15.Picture 3, add 3=

16.Picture 6, add 3=

17.Picture 7, add 2=

18.Picture 5, add 3=

19.Picture 4, add 2=

20.Picture 1, add 4=

Page 3 of 4 — Two-Digit Mental Addition

Parent instruction

The child must picture a two-rod abacus. Say: “Picture the tens rod and the ones rod. Place {number}, now add {number}to the ones rod. What is the result?”

21.Picture 12, add 5=

22.Picture 23, add 4=

23.Picture 15, add 3=

24.Picture 31, add 6=

25.Picture 14, add 4=

26.Picture 22, add 7=

27.Picture 16, add 2=

28.Picture 25, add 3=

29.Picture 11, add 8=

30.Picture 34, add 5=

Page 4 of 4 — Addition Chains

Parent instruction

Read each number one at a time with a 2-second pause. The child updates their mental image with each addition. They write only the final answer.

31.3 + 2 + 4=

32.1 + 5 + 3=

33.2 + 2 + 2 + 3=

34.4 + 1 + 3=

35.5 + 2 + 1 + 1=

36.6 + 3 + 1=

37.2 + 3 + 4 + 1=

38.7 + 1 + 2=

39.1 + 1 + 1 + 1 + 5=

40.3 + 3 + 3=

Score

36+ = Strong mental image · 28-35 = Developing well · below 28 = Return to flash visualization

___ / 40

Page 1: ___ / 10

Page 2: ___ / 10

Page 3: ___ / 10

Page 4: ___ / 10

Part of these learning packs

Mental Bridge Practice Pack

14 printable pages for Mental Abacus Bridge — flash visualization drills, mental addition sequences, and independent practice sheets

Hold a number in your mental image, add another, write the result. No physical abacus allowed.

These packs include this resource alongside other printables, tools, and study guides — curated for a specific goal. View all packs →

TamilGenius Lab · tamilgeniuslab.com · Free Tamil-first education for every child

This is a premium resource. Print unlimited copies for personal and classroom use.