Let’s solve each expression one by one, following the order of operations:
multiplication and division first (left to right), then addition and subtraction (left to right).
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1) 4.25 × 1.4 + 9
First, multiply:
4.25 × 1.4 = ?
Break it down:
4.25 × 1 = 4.25
4.25 × 0.4 = 1.7
So, 4.25 + 1.7 =
5.95
Now add 9:
5.95 + 9 =
14.95
✔ Final Answer for #1:
14.95
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2) 927 ÷ 3 × 2.5 – 0.17
Division and multiplication from left to right:
927 ÷ 3 =
309
Then: 309 × 2.5
Think: 309 × 2 = 618, 309 × 0.5 = 154.5 → total = 618 + 154.5 =
772.5
Now subtract 0.17:
772.5 – 0.17 =
772.33
✔ Final Answer for #2:
772.33
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3) 19 + 6.14 × 3.5 + 6
Multiply first: 6.14 × 3.5
Calculate:
6.14 × 3 = 18.42
6.14 × 0.5 = 3.07
Total = 18.42 + 3.07 =
21.49
Now add: 19 + 21.49 + 6
19 + 21.49 = 40.49
40.49 + 6 =
46.49
✔ Final Answer for #3:
46.49
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4) 81 – 0.96 ÷ 1.2
Divide first: 0.96 ÷ 1.2
You can think: 0.96 ÷ 1.2 = 96 ÷ 120 = 0.8
(Or: 1.2 × 0.8 = 0.96 → so yes, 0.8)
Now subtract: 81 – 0.8 =
80.2
✔ Final Answer for #4:
80.2
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5) 7.2 ÷ 0.08 + 15.2
Divide first: 7.2 ÷ 0.08
Move decimal: 720 ÷ 8 =
90
Add 15.2: 90 + 15.2 =
105.2
✔ Final Answer for #5:
105.2
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6) 2.4 × 0.3 + 36 – 5.6
Multiply first: 2.4 × 0.3 =
0.72
Now do left to right:
0.72 + 36 = 36.72
36.72 – 5.6 =
31.12
✔ Final Answer for #6:
31.12
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7) 42 – 3.4 × 7.5 – 0.18
Multiply first: 3.4 × 7.5
3.4 × 7 = 23.8
3.4 × 0.5 = 1.7
Total = 23.8 + 1.7 =
25.5
Now subtract left to right:
42 – 25.5 = 16.5
16.5 – 0.18 =
16.32
✔ Final Answer for #7:
16.32
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8) 21.3 – 2.12 × 8.5
Multiply first: 2.12 × 8.5
Break it:
2.12 × 8 = 16.96
2.12 × 0.5 = 1.06
Total = 16.96 + 1.06 =
18.02
Subtract: 21.3 – 18.02 =
3.28
✔ Final Answer for #8:
3.28
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9) 1.6 × 9.3 – 5
Multiply: 1.6 × 9.3
1.6 × 9 = 14.4
1.6 × 0.3 = 0.48
Total = 14.4 + 0.48 =
14.88
Subtract 5: 14.88 – 5 =
9.88
✔ Final Answer for #9:
9.88
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10) 9.9 + 3 × 1.5 + 13.4
Multiply first: 3 × 1.5 =
4.5
Now add left to right:
9.9 + 4.5 = 14.4
14.4 + 13.4 =
27.8
✔ Final Answer for #10:
27.8
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Final Answer:
1) 14.95
2) 772.33
3) 46.49
4) 80.2
5) 105.2
6) 31.12
7) 16.32
8) 3.28
9) 9.88
10) 27.8
Parent Tip: Review the logic above to help your child master the concept of numerical expression.
