1/10 - 2/10 = -1/10
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0.3 1 tenth + 2 tenths = 0.1+0.2=0.3
0.1 = 1 tenth Added together, they equal 0.2 or 2 tenths
2 miles ÷ 1/10 = 2 × 10 tenth miles = 20 tenth miles in 2 miles.
8.2 8 is the ones column, 2 is the tenths, and 1 is the hundredths. If the hundredths are 5 or higher then rounding to the tenths you add one to the tenths place and drop the hundredths. Since 1 is less than 5 the nearest tenth is 8.2
2 copies of 4 tenth is 8 tenth.