Let's solve each problem step by step. The task is to
identify the decimal number after adding a certain amount of tenths, hundredths, or thousandths to a given whole number.
We’ll go through each question one by one and explain the reasoning.
---
1) If a number is 7, if we add 5 tenths more then the new number will be?
- 5 tenths = 0.5
- 7 + 0.5 =
7.5
✔ Answer: 7.5
---
2) If a number is 12, if we add 3 tenths more then the new number will be?
- 3 tenths = 0.3
- 12 + 0.3 =
12.3
✔ Answer: 12.3
---
3) If a number is 47, if we add 8 tenths more then the new number will be?
- 8 tenths = 0.8
- 47 + 0.8 =
47.8
✔ Answer: 47.8
---
4) If a number is 27, if we add 9 tenths and 4 hundredths more then the new number will be?
- 9 tenths = 0.9
- 4 hundredths = 0.04
- Total added = 0.9 + 0.04 = 0.94
- 27 + 0.94 =
27.94
✔ Answer: 27.94
---
5) If a number is 57, if we add 9 tenths and 3 hundredths more then the new number will be?
- 9 tenths = 0.9
- 3 hundredths = 0.03
- Total = 0.9 + 0.03 = 0.93
- 57 + 0.93 =
57.93
✔ Answer: 57.93
---
6) If a number is 87, if we add 2 tenths and 9 hundredths more then the new number will be?
- 2 tenths = 0.2
- 9 hundredths = 0.09
- Total = 0.2 + 0.09 = 0.29
- 87 + 0.29 =
87.29
✔ Answer: 87.29
---
7) If a number is 15, if we add 2 tenths, 5 hundredths, and 4 thousandths more then the new number will be?
- 2 tenths = 0.2
- 5 hundredths = 0.05
- 4 thousandths = 0.004
- Total = 0.2 + 0.05 + 0.004 = 0.254
- 15 + 0.254 =
15.254
✔ Answer: 15.254
---
8) If a number is 18, if we add 5 tenths, 7 hundredths, and 2 thousandths more then the new number will be?
- 5 tenths = 0.5
- 7 hundredths = 0.07
- 2 thousandths = 0.002
- Total = 0.5 + 0.07 + 0.002 = 0.572
- 18 + 0.572 =
18.572
✔ Answer: 18.572
---
9) If a number is 10, if we add 3 tenths, 2 hundredths, and 5 thousandths more then the new number will be?
- 3 tenths = 0.3
- 2 hundredths = 0.02
- 5 thousandths = 0.005
- Total = 0.3 + 0.02 + 0.005 = 0.325
- 10 + 0.325 =
10.325
✔ Answer: 10.325
---
10) If a number is 25, if we add 4 hundredths and 4 thousandths more then the new number will be?
- 4 hundredths = 0.04
- 4 thousandths = 0.004
- Total = 0.04 + 0.004 = 0.044
- 25 + 0.044 =
25.044
✔ Answer: 25.044
---
✔ Final Answers:
1. 7.5
2. 12.3
3. 47.8
4. 27.94
5. 57.93
6. 87.29
7. 15.254
8. 18.572
9. 10.325
10. 25.044
---
🔍 Explanation Summary:
-
Tenths are the first digit after the decimal point (e.g., 0.1).
-
Hundredths are the second digit (e.g., 0.01).
-
Thousandths are the third digit (e.g., 0.001).
- When adding decimals, align the place values and add accordingly.
- Always keep track of decimal places when writing the final answer.
Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of decimal place value worksheet.
