Page 84 - Start Up Mathematics_1

H T O
2. ? 7 ? bigger Step 1: To find the bigger missing
number
number in the ones column,
– 3 ? 6 smaller add the smaller number to the
number
difference.
5 5 3 difference
6 + 3 = 9

H T O
Step 2: To find the smaller missing number
? 7 9
in the tens column, subtract the
– 3 ? 6 difference from the bigger number.

5 5 3 7 – 5 = 2

H T O
? 7 9 Step 3: To find the bigger missing number
in the hundreds column, add the
– 3 2 6 smaller number to the difference.

5 5 3 3 + 5 = 8

Checking

H T O

5 5 3 difference Step 4: To check, add the difference and
the smaller number.
+ 3 2 6 smaller
number

8 7 9 bigger
number

7 Find the missing digits.

T O T O T O T O
(a) (b) (c) (d)
5 ? ? 8 9 8 5 9

– 3 4 – 2 ? – 4 ? – 1 ?

? 3 4 5 5 6 4 7

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