Question

multiply:

1. $\begin{array}{r}2.1\\× 0.76\hlineend{array}$
2. $\begin{array}{r}52.4\\× 4.5\hlineend{array}$
3. $\begin{array}{r}4.52\\× 8.9\hlineend{array}$
4. $\begin{array}{r}5.8\\× 7.4\hlineend{array}$
5. $\begin{array}{r}0.97\\× 0.23\hlineend{array}$
6. $\begin{array}{r}63.52\\× 4.7\hlineend{array}$
7. $\begin{array}{r}2.7\\× 0.25\hlineend{array}$
8. $\begin{array}{r}8.35\\× 0.46\hlineend{array}$
9. $\begin{array}{r}0.813\\× 4.6\hlineend{array}$
10. $\begin{array}{r}0.83\\× 5.8\hlineend{array}$
11. $\begin{array}{r}12.3\\× 6.5\hlineend{array}$
12. $\begin{array}{r}0.78\\× 42.5\hlineend{array}$
13. $\begin{array}{r}912.5\\× 0.85\hlineend{array}$
14. $\begin{array}{r}3.6\\× 8.14\hlineend{array}$
15. $\begin{array}{r}0.64\\× 31.8\hlineend{array}$
16. $\begin{array}{r}5.6\\× 21.42\hlineend{array}$

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Explanation:

Problem 1: \( \boldsymbol{2.1 \times 0.76} \)

Step1: Multiply as whole numbers

\( 21 \times 76 = 1596 \)

Step2: Count decimal places

2.1 has 1 decimal place, 0.76 has 2 decimal places. Total: \( 1 + 2 = 3 \)

Step3: Place decimal

\( \frac{1596}{1000} = 1.596 \)

Step1: Multiply as whole numbers

\( 524 \times 45 = 23580 \)

Step2: Count decimal places

52.4 has 1, 4.5 has 1. Total: \( 1 + 1 = 2 \)

Step3: Place decimal

\( \frac{23580}{100} = 235.8 \)

Step1: Multiply as whole numbers

\( 452 \times 89 = 40228 \)

Step2: Count decimal places

4.52 has 2, 8.9 has 1. Total: \( 2 + 1 = 3 \)

Step3: Place decimal

\( \frac{40228}{1000} = 40.228 \)

Answer:

\( 1.596 \)

Problem 2: \( \boldsymbol{52.4 \times 4.5} \)