Here are the solutions for the multiplication problems. I have worked through each one carefully to ensure accuracy.
1. $16.0 \times 8$
* Multiply $16 \times 8$:
* $6 \times 8 = 48$ (write down 8, carry over 4)
* $1 \times 8 = 8$, plus the carried 4 is 12.
* Result:
128.0 (or just 128)
2. $45.3 \times 4$
* Ignore the decimal first and multiply $453 \times 4$:
* $3 \times 4 = 12$ (write down 2, carry over 1)
* $5 \times 4 = 20$, plus the carried 1 is 21 (write down 1, carry over 2)
* $4 \times 4 = 16$, plus the carried 2 is 18.
* The number is 1812. Since there was one decimal place in the original problem ($45.3$), put the decimal point one spot from the right.
* Result:
181.2
3. $14.7 \times 2$
* Multiply $147 \times 2$:
* $7 \times 2 = 14$ (write down 4, carry over 1)
* $4 \times 2 = 8$, plus the carried 1 is 9.
* $1 \times 2 = 2$.
* The number is 294. Put the decimal point one spot from the right.
* Result:
29.4
4. $39.9 \times 3$
* Multiply $399 \times 3$:
* $9 \times 3 = 27$ (write down 7, carry over 2)
* $9 \times 3 = 27$, plus the carried 2 is 29 (write down 9, carry over 2)
* $3 \times 3 = 9$, plus the carried 2 is 11.
* The number is 1197. Put the decimal point one spot from the right.
* Result:
119.7
5. $75.1 \times 9$
* Multiply $751 \times 9$:
* $1 \times 9 = 9$
* $5 \times 9 = 45$ (write down 5, carry over 4)
* $7 \times 9 = 63$, plus the carried 4 is 67.
* The number is 6759. Put the decimal point one spot from the right.
* Result:
675.9
6. $14.9 \times 5$
* Multiply $149 \times 5$:
* $9 \times 5 = 45$ (write down 5, carry over 4)
* $4 \times 5 = 20$, plus the carried 4 is 24 (write down 4, carry over 2)
* $1 \times 5 = 5$, plus the carried 2 is 7.
* The number is 745. Put the decimal point one spot from the right.
* Result:
74.5
7. $58.0 \times 5$
* Multiply $58 \times 5$:
* $8 \times 5 = 40$ (write down 0, carry over 4)
* $5 \times 5 = 25$, plus the carried 4 is 29.
* Result:
290.0 (or just 290)
8. $89.9 \times 4$
* Multiply $899 \times 4$:
* $9 \times 4 = 36$ (write down 6, carry over 3)
* $9 \times 4 = 36$, plus the carried 3 is 39 (write down 9, carry over 3)
* $8 \times 4 = 32$, plus the carried 3 is 35.
* The number is 3596. Put the decimal point one spot from the right.
* Result:
359.6
9. $23.3 \times 1$
* Any number multiplied by 1 stays the same.
* Result:
23.3
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Final Answer:
1. 128
2. 181.2
3. 29.4
4. 119.7
5. 675.9
6. 74.5
7. 290
8. 359.6
9. 23.3
Parent Tip: Review the logic above to help your child master the concept of multiplying decimal worksheet.
