Unit 9 – The four operations
485 + 143 400 + 100 = 500 80 + 40 = 120 5 + 3 = 8 + 628
2 Look at the column method of addition for 485 + 143. H T O
H T O 4 8 5 + 1 4 3 6 2 8 1
+
We start by adding the ones: 5 ones + 3 ones = 8 ones 8 tens + 4 tens = 12 tens 4 hundreds + 1 hundred plus 1 more hundred = 6 hundreds
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