Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 431 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 47 × 23 = 1082 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 62 = 3475 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 592 + 712 = 1313 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 99 × 94 = 9306 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 956 + 400 = 1356 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 133 + 538 = 666 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 35 × 21 = 735 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 63 × 37 = 2330 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 763 + 265 = 1028 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 221 + 260 = 481 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 794 + 429 = 1221 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 75 × 66 = 4950 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 69 = 6834 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 163 + 796 = 959 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 51 × 88 = 4485 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 839 + 850 = 1689 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 560 + 286 = 847 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 87 × 24 = 2084 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 889 + 620 = 1509 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 98 × 70 = 6857 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 739 + 132 = 868 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 440 + 230 = 670 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 70 × 99 = 6930 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 465 + 602 = 1075 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 68 × 42 = 2856 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 99 × 89 = 8811 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 15 × 36 = 533 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 201 + 813 = 1014 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 887 + 147 = 1039 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 162 + 435 = 606 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 186 + 974 = 1160 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 16 × 82 = 1304 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 326 + 334 = 659 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 16 × 31 = 497 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 51 × 61 = 3111 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 273 + 586 = 859 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 90 × 99 = 8905 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 248 + 908 = 1156 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 69 × 69 = 4761 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 830 + 729 = 1567 right or wrong? (a) Wrong (b) Right

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