Multiply a decimal by a whole number
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. 0.7 × 5 = ?
2. 0.8 × 6 = ?
3. 0.9 × 5 = ?
4. 0.4 × 8 = ?
5. 0.1 × 4 = ?
Answer key · Multiply a decimal by a whole number
1. 3.5
0.7 is 7 tenths.
7 × 5 = 35, so the product is 35 tenths.
35 tenths = 3.5, so 0.7 × 5 = 3.5
2. 4.8
0.8 is 8 tenths.
8 × 6 = 48, so the product is 48 tenths.
48 tenths = 4.8, so 0.8 × 6 = 4.8
3. 4.5
0.9 is 9 tenths.
9 × 5 = 45, so the product is 45 tenths.
45 tenths = 4.5, so 0.9 × 5 = 4.5
4. 3.2
0.4 is 4 tenths.
4 × 8 = 32, so the product is 32 tenths.
32 tenths = 3.2, so 0.4 × 8 = 3.2
5. 0.4
0.1 is 1 tenths.
1 × 4 = 4, so the product is 4 tenths.
4 tenths = 0.4, so 0.1 × 4 = 0.4
Try it together
Fold two equal strips of paper into different numbers of equal parts. Find two fractions that cover the same length.