3.1 Another calculator activity
This next number puzzle involves doing calculations.
Activity 4 Cross-number puzzle
Timing: Allow approximately 10 minutes
Here’s a cross-number puzzle to give you some more practice using your calculator. It’s like a crossword puzzle, only with numbers instead of words. You may want to download and print the puzzle [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] , and then use your calculator to solve it.
| Across | Down |
|---|---|
| 1. 21 × 47 | 1. 19 × 5 |
| 4. 1788 ÷ 6 | 2. 8003 × 9 |
| 6. 497 – 105 + 12 | 3. 1234 – 1216 |
| 7. 1458 ÷ 3 × 2 | 5. 1 + 11 + 111 – 29 |
| 9. 32 + 681 – 13 | 6. 517 ÷ 11 |
| 7. 21 × 33 ÷ 7 | |
| 8. 49 + 49 – 48 |
Answer
| Across | Down |
|---|---|
| 1. 21 × 47 = 987 | 1. 19 × 5 = 95 |
| 4. 1788 ÷ 6 = 298 | 2. 8003 × 9 = 72027 |
| 6. 497 – 105 + 12 = 404 | 3. 1234 – 1216 = 18 |
| 7. 1458 ÷ 3 × 2 = 972 | 5. 1 + 11 + 111 – 29 = 94 |
| 9. 32 + 681 – 13 = 700 | 6. 517 ÷ 11 = 47 |
| 7. 21 × 33 ÷ 7 = 99 | |
| 8. 49 + 49 – 48 = 50 |
You’ll now turn your attention to repeated multiplication of the same number, which is exponents or powers.