Question

*23.
(4 - 0.4) ÷ 4
answer:
*24.
4 - (0.4 ÷ 4)
answer:
*25. mentally calculate each answer
a. 7.4 × 10
b. 7.4 × 100
c. 7.4 ÷ 10
d. 7.4 ÷ 100

Explanation:

Problem 23:

Step1: Calculate inside the parentheses

First, we need to solve the expression inside the parentheses, which is \(4 - 0.4\).
\(4 - 0.4 = 3.6\)

Step2: Divide the result by 4

Now, we divide the result from Step 1 by 4.
\(3.6\div4 = 0.9\)

Step1: Calculate inside the parentheses

First, we solve the expression inside the parentheses, which is \(0.4\div4\).
\(0.4\div4 = 0.1\)

Step2: Subtract the result from 4

Now, we subtract the result from Step 1 from 4.
\(4 - 0.1 = 3.9\)

Step1: Recall the rule for multiplying by 10

When a decimal number is multiplied by 10, we move the decimal point one place to the right.
For \(7.4\times10\), moving the decimal point in \(7.4\) one place to the right gives \(74\).

Answer:

\(0.9\)

Problem 24: