Page 34 - SPARK OF MATH book 6
P. 34
(3-1) Adding and subtracting metric units.
The standard unit of length is the meter.
We use different units to measure different lengths:
Millimeter, centimeter, and decimeter measure small things
Meter and kilometer measure longer things
To add 1900 cm+23 m+25.9 m
Step 1: Convert to the same units
1900 cm= 19 m
km
× 10
m
dm
÷ 10 cm
mm
Step 2: Add units. 19.0
19 m+23 m+25.9 m= 67.9 m 23.0
+ 25.9
67.9
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