2 What is different about the addition 0.6 + 0.5?
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
=
+
+ 0.4
+ 0.1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.1 1.2 1.3 1
6 tenths + 5 tenths = 6 tenths + 4 tenths + 1 tenth so, 0.6 + 0.5 = 1.1. We regroup 10 tenths to make one whole. 3 Let’s look at some methods to complete the subtraction 0.9 − 0.2 = 0.7. What is the same and what is different about them?
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 9 tenths − 2 tenths = 7 tenths
• •
− 2 tenths
– 0.2
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
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