ABACUS TEST - 4: A math worksheet focusing on +10's complement calculations with 30 practice problems organized in a grid.

Let’s solve each column step by step. We’ll add all the numbers in each column from top to bottom.

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Column 1:
5 + 3 = 8
8 + 4 = 12
12 + 2 = 14

Column 2:
4 + 5 = 9
9 + 2 = 11
11 + 5 = 16

Column 3:
8 + 5 = 13
13 + 1 = 14
14 - 3 = 11

Column 4:
9 + 6 = 15
15 + 3 = 18
18 - 5 = 13

Column 5:
7 + 8 = 15
15 + 2 = 17
17 + 1 = 18

Column 6:
9 + 1 = 10
10 + 8 = 18
18 - 2 = 16

Column 7:
8 + 3 = 11
11 + 5 = 16
16 - 6 = 10

Column 8:
8 + 7 = 15
15 + 3 = 18
18 - 8 = 10

Column 9:
6 + 9 = 15
15 - 5 = 10
10 + 2 = 12

Column 10:
5 + 4 = 9
9 + 1 = 10
10 + 5 = 15

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Column 11:
3 + 5 = 8
8 + 3 = 11
11 + 5 = 16

Column 12:
5 + 2 = 7
7 + 3 = 10
10 + 4 = 14

Column 13:
4 + 5 = 9
9 + 5 = 14
14 + 5 = 19

Column 14:
2 + 2 = 4
4 + 6 = 10
10 + 5 = 15

Column 15:
3 + 1 = 4
4 + 7 = 11
11 + 4 = 15

Column 16:
1 + 2 = 3
3 + 8 = 11
11 + 5 = 16

Column 17:
8 + 8 = 16
16 + 10 = 26
26 - 6 = 20

Column 18:
5 + 4 = 9
9 + 6 = 15
15 + 4 = 19

Column 19:
9 + 1 = 10
10 + 9 = 19
19 - 8 = 11

Column 20:
5 + 1 = 6
6 + 4 = 10
10 + 8 = 18

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Column 21:
10 + 8 = 18
18 + 5 = 23
23 + 1 = 24

Column 22:
8 + 2 = 10
10 + 5 = 15
15 + 3 = 18

Column 23:
1 + 9 = 10
10 + 5 = 15
15 + 2 = 17

Column 24:
3 + 7 = 10
10 + 6 = 16
16 - 1 = 15

Column 25:
7 + 4 = 11
11 + 5 = 16
16 + 4 = 20

Column 26:
5 + 5 = 10
10 + 5 = 15
15 + 5 = 20

Column 27:
8 + 8 = 16
16 - 5 = 11
11 - 1 = 10

Column 28:
5 + 1 = 6
6 + 4 = 10
10 + 8 = 18

Column 29:
5 + 2 = 7
7 + 3 = 10
10 + 5 = 15

Column 30:
9 + 2 = 11
11 + 5 = 16
16 - 1 = 15

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Final Answer:
14, 16, 11, 13, 18, 16, 10, 10, 12, 15,
16, 14, 19, 15, 15, 16, 20, 19, 11, 18,
24, 18, 17, 15, 20, 20, 10, 18, 15, 15