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Mental Math worksheet for second grade students to practice adding and subtracting 10 and 100 from given numbers.

A black and white mental math worksheet for second grade students, featuring a table with numbers and columns for calculating "10 More," "10 Less," "100 More," and "100 Less." The worksheet includes a heart illustration and a decorative border.

A black and white mental math worksheet for second grade students, featuring a table with numbers and columns for calculating "10 More," "10 Less," "100 More," and "100 Less." The worksheet includes a heart illustration and a decorative border.

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Show Answer Key & Explanations Step-by-step solution for: Printable Mental Maths Worksheets for Grade 1
Let’s solve each row step by step.

We are given a number, and we need to find:
- 10 more (add 10)
- 10 less (subtract 10)
- 100 more (add 100)
- 100 less (subtract 100)

---

Row 1: Number = 476

- 10 more → 476 + 10 = 486
- 10 less → 476 - 10 = 466
- 100 more → 476 + 100 = 576
- 100 less → 476 - 100 = 376

Check: All correct.

---

Row 2: Number = 261

- 10 more → 261 + 10 = 271
- 10 less → 261 - 10 = 251
- 100 more → 261 + 100 = 361
- 100 less → 261 - 100 = 161

Check: All correct.

---

Row 3: Number = 852

- 10 more → 852 + 10 = 862
- 10 less → 852 - 10 = 842
- 100 more → 852 + 100 = 952
- 100 less → 852 - 100 = 752

Check: All correct.

---

Row 4: Number = 758

- 10 more → 758 + 10 = 768
- 10 less → 758 - 10 = 748
- 100 more → 758 + 100 = 858
- 100 less → 758 - 100 = 658

Check: All correct.

---

Row 5: Number = 663

- 10 more → 663 + 10 = 673
- 10 less → 663 - 10 = 653
- 100 more → 663 + 100 = 763
- 100 less → 663 - 100 = 563

Check: All correct.

---

Row 6: Number = 329

- 10 more → 329 + 10 = 339
- 10 less → 329 - 10 = 319
- 100 more → 329 + 100 = 429
- 100 less → 329 - 100 = 229

Check: All correct.

---

Row 7: Number = 165

- 10 more → 165 + 10 = 175
- 10 less → 165 - 10 = 155
- 100 more → 165 + 100 = 265
- 100 less → 165 - 100 = 65

Check: All correct.

---

Final Answer:

| Number | 10 More | 10 Less | 100 More | 100 Less |
|--------|---------|---------|----------|----------|
| 476 | 486 | 466 | 576 | 376 |
| 261 | 271 | 251 | 361 | 161 |
| 852 | 862 | 842 | 952 | 752 |
| 758 | 768 | 748 | 858 | 658 |
| 663 | 673 | 653 | 763 | 563 |
| 329 | 339 | 319 | 429 | 229 |
| 165 | 175 | 155 | 265 | 65 |
Parent Tip: Review the logic above to help your child master the concept of mental math worksheets.
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