Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 872 · 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 94 × 25 = 2350 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 192 + 121 = 304 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 21 × 17 = 349 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 934 + 402 = 1330 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 434 + 616 = 1057 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 135 + 982 = 1119 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 36 × 15 = 540 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 267 + 675 = 942 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 936 + 597 = 1533 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 161 + 348 = 509 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 759 + 318 = 1077 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 204 + 132 = 341 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 968 + 566 = 1541 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 96 × 91 = 8736 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 21 = 252 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 960 + 442 = 1407 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 576 + 143 = 719 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 94 × 97 = 9127 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 14 = 624 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 98 = 9016 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 639 + 183 = 824 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 54 × 42 = 2277 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 78 × 74 = 5765 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 818 + 969 = 1795 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 440 + 559 = 999 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 424 + 428 = 852 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 487 + 469 = 956 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 99 × 80 = 7923 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 51 × 61 = 3103 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 821 + 656 = 1473 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 14 × 29 = 412 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 79 × 56 = 4427 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 45 × 70 = 3152 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 30 × 64 = 1920 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 310 + 736 = 1052 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 799 + 342 = 1144 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 36 = 1220 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 63 = 2016 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 228 + 725 = 953 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 24 × 60 = 1443 right or wrong? (a) Wrong (b) Right

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