Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 37 · 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 55 × 73 = 4014 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 90 × 93 = 8362 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 798 + 565 = 1370 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 42 × 17 = 718 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 49 × 15 = 744 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 76 × 57 = 4332 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 386 + 321 = 707 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 22 × 63 = 1386 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 95 × 94 = 8937 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 913 + 222 = 1135 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 751 + 829 = 1580 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 51 × 37 = 1887 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 944 + 316 = 1260 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 349 + 260 = 602 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 133 + 480 = 608 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 735 + 271 = 1013 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 65 × 71 = 4615 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 118 + 242 = 360 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 717 + 600 = 1312 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 82 = 3690 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 456 + 218 = 674 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 12 = 876 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 908 + 234 = 1142 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 900 + 412 = 1309 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 25 × 98 = 2450 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 18 × 25 = 442 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 29 × 36 = 1047 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 47 × 92 = 4324 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 146 + 272 = 418 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 98 × 14 = 1381 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 49 × 67 = 3283 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 544 + 751 = 1295 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 49 × 77 = 3773 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 23 × 55 = 1261 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 32 × 92 = 2944 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 405 + 317 = 713 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 80 × 95 = 7594 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 49 × 82 = 4018 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 56 × 76 = 4256 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 72 × 20 = 1436 right or wrong? (a) Wrong (b) Right

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