Succeed with maths – Part 1

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# 2.1 Another calculator activity

This next number puzzle, unlike Sudoku, involves doing calculations.

## Activity 3 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.

Figure 6 Blank 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

Figure 7 Completed cross-number puzzle

Well done, you’ve completed two number puzzles already and started to build problem-solving skills as well! After all a problem is just another word for a puzzle. So before you move on to thinking about how numbers are put together, you’re going to spend some time thinking about problem solving and completing one more puzzle (or problem).