Unit 9 – Addition and subtraction
Adding 2-digit and 3-digit numbers
1 We can complete the addition 154 + 32 in different ways.
Adding place value parts 154 + 32 = 100 + 50 + 4 + 30 + 2 = 100 + 80 + 6 = 186
+30
+2
154
184 186
Adding on 154 + 32 = 154 + 30 + 2 = 184 + 2 = 186
What is the same and what is different about the methods?
2 What is different about the addition 159 + 32? Look at what happens when the 9 ones and 2 ones are added.
1
5
9
1
9
1
159 + 32 = 100 + 50 + 9 + 30 + 2 = 100 + 80 + 11 = 191
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03/05/2022 10:19
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