Adding and subtracting decimals Let’s Learn Together
A stop sign has a height of 2.56 m. A traffic light has a height of 3.1 m. How much taller is the traffic light than the stop sign?
1
Always estimate your answer first.
The stop sign is about 2 and a half, and the traffic light is about 3, so I expect my answer to be about a half.
We can use a written method to find the difference.
2 3
10 1
1 0
− 2
5
6
0
5
4
Or we can use a mental strategy.
+0.44
+0.1
2.56
3
3.1
0.44 + 0.1 = 0.54 The difference in height between the traffic light and the stop sign is 0.54 m.
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01/12/2021 14:54
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