Page 80 - Start Up Mathematics_1

H T O
5 13 Step 4: Keep the hundreds.
5 6 3

– ↓ 2 5

5 3 8

H T O
2. Step 1: Subtract the ones. 8 being bigger than 5
4 3 5
cannot be subtracted.
– 2 6 8

H T O
2 15 Step 2: Take 1 ten from the tens column and add
4 3 5
it to 5 ones.

– 2 6 8 10 ones + 5 ones = 15 ones = 15
7 15 being bigger than 8, subtract.

15 – 8 = 7

Change 3 tens to 2 tens in the tens column.
H T O
3 12 2 15 Step 3: Subtract the remaining tens. 6 being
4 3 5
bigger than 2 cannot be subtracted.
– 2 6 8 Take 1 hundred from the hundreds column

6 7 and add it to 2 tens. (1 hundred = 10 tens)
10 tens + 2 tens = 12 tens

12 being bigger than 6, subtract.

12 – 6 = 6

Change 4 hundreds to 3 hundreds in the
hundreds column.
H T O
3 12 2 15 Step 4: Subtract the remaining hundreds.
4 3 5

– 2 6 8

1 6 7

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