Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 695 · 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 96 × 24 = 2304 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 96 × 27 = 2592 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 415 + 376 = 791 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 93 × 24 = 2230 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 84 × 69 = 5789 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 15 × 56 = 840 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 967 + 688 = 1655 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 15 × 54 = 802 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 400 + 762 = 1160 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 588 + 782 = 1370 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 69 × 85 = 5867 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 115 + 822 = 934 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 16 × 18 = 288 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 12 × 20 = 244 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 63 × 33 = 2079 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 259 + 129 = 388 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 214 + 540 = 759 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 65 × 24 = 1560 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 91 × 67 = 6089 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 939 + 210 = 1154 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 28 × 57 = 1595 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 878 + 635 = 1513 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 161 + 959 = 1119 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 733 + 719 = 1452 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 18 × 52 = 936 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 14 × 19 = 268 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 673 + 998 = 1662 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 455 + 497 = 952 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 77 × 20 = 1540 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 29 × 88 = 2552 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 106 + 572 = 678 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 669 + 991 = 1664 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 233 + 441 = 674 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 993 + 358 = 1342 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 221 + 907 = 1128 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 60 × 15 = 900 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 64 × 70 = 4480 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 61 × 61 = 3721 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 81 = 1534 right or wrong? (a) Wrong (b) Right

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