Question

9.
\

$$\begin{array}{r} 0.4 \\\\ \\times 0.04 \\\\ \\end{array}$$

10.
\

$$\begin{array}{r} 4.23 \\\\ \\times \\ \\ 2 \\\\ \\end{array}$$

11.
\

$$\begin{array}{r} 0.2 \\\\ \\times 0.45 \\\\ \\end{array}$$

12.
\

$$\begin{array}{r} 2.68 \\\\ \\times 0.298 \\\\ \\end{array}$$

41|waterworks mathematics

Explanation:

Step1: Multiply 4 and 4

$4 \times 4 = 16$

Step2: Count decimal places (1+2=3)

$0.4 \times 0.04 = 0.016$

Step1: Multiply 423 and 2

$423 \times 2 = 846$

Step2: Count decimal places (2+0=2)

$4.23 \times 2 = 8.46$

Step1: Multiply 2 and 45

$2 \times 45 = 90$

Step2: Count decimal places (1+2=3)

$0.2 \times 0.45 = 0.090 = 0.09$

Step1: Multiply 268 and 298

$268 \times 298 = 268 \times (300-2) = 80400 - 536 = 79864$

Step2: Count decimal places (2+3=5)

$2.68 \times 0.298 = 0.79864$

Answer:

1. $0.016$
2. $8.46$
3. $0.09$
4. $0.79864$