Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 235 · 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 31 × 49 = 1512 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 875 + 432 = 1307 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 29 × 16 = 469 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 798 + 482 = 1280 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 855 + 273 = 1128 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 369 + 596 = 969 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 303 + 992 = 1301 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 18 × 12 = 218 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 41 × 24 = 984 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 54 × 17 = 917 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 964 + 109 = 1073 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 583 + 432 = 1015 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 84 × 75 = 6304 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 18 × 63 = 1134 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 116 + 162 = 278 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 33 × 94 = 3102 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 12 × 27 = 324 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 250 + 991 = 1249 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 18 × 65 = 1170 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 80 = 3602 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 45 × 45 = 2025 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 722 + 470 = 1196 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 178 + 692 = 869 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 218 + 708 = 926 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 63 × 78 = 4919 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 309 + 757 = 1074 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 76 × 34 = 2584 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 602 + 408 = 1010 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 52 × 94 = 4888 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 86 × 35 = 3010 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 260 + 431 = 684 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 37 × 15 = 550 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 77 × 27 = 2079 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 76 = 2805 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 71 × 68 = 4828 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 66 × 29 = 1914 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 98 × 93 = 9114 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 40 × 42 = 1676 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 57 = 912 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 87 = 2784 right or wrong? (a) Wrong (b) Right

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