Page 53 - Start Up Mathematics_3

Example 5: Subtract 2346 from 6879 and check your answer.

Solution: Checking
Th H T O Th H T O

6 8 7 9 ← Minuend 4 5 3 3 ← Difference

– 2 3 4 6 ← Subtrahend + 2 3 4 6 ← Subtrahend

4 5 3 3 ← Difference 6 8 7 9 ← Minuend

So, our subtraction is correct.

Example 6: Subtract 2984 from 7420 and check your answer.

Solution: Th H T O
Mental Maths
13 11
6 3 1 10
7 4 2 0 ← Minuend Check subtraction.
– 2 9 8 4 ← Subtrahend 8500 – 4050 = 4450

4 4 3 6 ← Difference

Checking

Th H T O
1 1 1
4 4 3 6 ← Difference

+ 2 9 8 4 ← Subtrahend

7 4 2 0 ← Minuend

So, our subtraction is correct.

Finding the Missing Digits

Let’s learn how to find the missing digits in a problem on subtraction, with the help
of an example.

Example 7: Find the missing digits and check your answer.
Th H T O Remember

? 8 2 1 Always start from ones,

– 6 ? 8 6 then move to tens,
hundreds and then
3 5 ? ? thousands.

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