Page 56 - Math Genius C2

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\ 26-Sep-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

SUBTRACTION ON A NUmBeR GRID

Anna wanted to surprise her mother on Mother’s

Day. She baked 56 apple pies.

Mother was very happy with Anna's pies. She invited

her neighbours to eat pies.

They managed to eat 24 pies in all.

Now, Anna wants to know how many pies are left.

For this, Anna uses a 100-number grid.
1 2 3 4 5 6 7 8 9 10
To subtract numbers on a number grid, she finds 11 12 13 14 15 16 17 18 19 20

the bigger number first, that is, 56. Then, she 21 22 23 24 25 26 27 28 29 30

moves up 2 rows (– 20) and reaches 36. 31 32 33 34 35 36 37 38 39 40

From 36, she moves left 4 steps (– 4). Finally, 41 42 43 44 45 46 47 48 49 50

she reaches 32. Hence, 56 – 24 = 32. 51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70

32 33 34 35 36 71 72 73 74 75 76 77 78 79 80

–1 –1 –1 –1 81 82 83 84 85 86 87 88 89 90
–10
Math Insight 91 92 93 94 95 96 97 98 99 100
On a number grid like the one shown 46
here, to subtract ones, we move Fast Check
leftwards and to subtract tens, we –10
move upwards. 56 Use the number grid to subtract.

1. 26 – 4 =

Thus, 32 pies are left with Anna.
2. 58 – 17 =

Practice Time 3A

1. Fill in the blanks.

(a) 22 – 0 = (b) 31 – = 31 (c) 67 – 67 =

(d) 93 – = 0 (e) 57 – 1 = (f) 88 – = 87

54 Mathematics-2