Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 31 · 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 29 × 44 = 1283 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 68 = 943 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 33 × 13 = 429 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 883 + 835 = 1726 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 68 × 28 = 1911 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 30 × 86 = 2580 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 62 × 33 = 2052 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 238 + 132 = 372 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 129 + 118 = 247 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 23 = 667 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 54 × 25 = 1350 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 898 + 204 = 1102 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 99 = 2574 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 13 × 21 = 273 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 35 × 59 = 2065 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 122 + 865 = 987 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 971 + 378 = 1349 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 633 + 609 = 1242 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 53 × 46 = 2438 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 81 × 59 = 4779 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 320 + 536 = 856 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 112 + 682 = 794 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 265 + 252 = 521 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 33 × 17 = 552 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 87 × 60 = 5220 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 79 × 47 = 3713 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 55 × 76 = 4173 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 93 × 36 = 3348 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 40 × 29 = 1160 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 404 + 276 = 671 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 77 × 31 = 2387 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 658 + 950 = 1600 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 577 + 486 = 1063 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 26 × 78 = 2028 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 14 × 85 = 1190 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 56 × 27 = 1515 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 826 + 282 = 1099 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 108 + 425 = 528 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 36 × 23 = 828 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 59 = 1475 right or wrong? (a) Right (b) Wrong

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