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Succeed with maths: part 1
Succeed with maths: part 1

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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.

An empty 5 × 5 crossword grid.
Figure 2 Blank cross-number puzzle
Table 2 Questions for cross-number puzzle
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

Answers to the calculations input into crossword grid.
Figure 3 Completed cross-number puzzle
Table 3 Answers for cross-number puzzle
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.