Page 89 - Arithmetic

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DO NOT DUPLICATE

Subtracting numbers horizontally by

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regrouping

Example 1

23 _ 19 =

Solution
_
23 19 = 4

Steps
_ _
1. Subtract the ones, 3 9 is 23 19 =

impossible. Impossible

2. Take 1 tens from the group of
2 tens and remain with 1 tens. 1 13
_
The group of ones become 23 19 =

10 + 3 = 13.

_
3. Subtract ones, 13 9 = 4. 113 _
Write 4 in the ones place. 23 19 = 4

_
4. Subtract tens, 1 1 = 0.
Leave the tens place empty. 1 13 _

23 19 = 4

The answer is 4

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Ministry of Education, Science and Technology
Mathematics STD 1.indd 82 03/08/2019 11:18