Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 354 · 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 76 × 86 = 6535 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 386 + 626 = 1012 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 701 + 196 = 897 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 19 × 51 = 972 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 354 + 585 = 939 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 57 × 14 = 794 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 310 + 573 = 891 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 62 × 89 = 5518 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 19 = 342 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 76 = 4256 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 56 × 12 = 672 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 97 = 3395 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 448 + 312 = 769 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 39 × 71 = 2774 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 13 = 624 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 218 + 837 = 1054 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 46 = 2722 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 743 + 974 = 1717 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 29 × 81 = 2354 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 156 + 830 = 986 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 79 × 62 = 4898 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 219 + 803 = 1022 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 79 = 2124 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 327 + 308 = 635 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 91 × 91 = 8276 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 671 + 314 = 985 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 90 × 59 = 5310 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 908 + 614 = 1522 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 919 + 286 = 1205 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 35 × 85 = 2975 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 729 + 227 = 956 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 90 = 2880 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 354 + 396 = 750 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 79 × 50 = 3950 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 256 + 221 = 477 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 228 + 400 = 628 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 66 = 6270 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 424 + 766 = 1190 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 718 + 264 = 982 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 81 × 63 = 5102 right or wrong? (a) Right (b) Wrong

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