Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 34 · 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 77 × 69 = 5318 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 66 = 1056 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 86 × 31 = 2666 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 69 × 94 = 6486 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 25 × 17 = 425 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 776 + 827 = 1603 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 166 + 816 = 982 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 96 × 35 = 3360 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 286 + 399 = 685 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 95 × 96 = 9116 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 635 + 142 = 778 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 916 + 297 = 1213 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 87 × 44 = 3820 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 693 + 437 = 1130 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 753 + 140 = 889 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 667 + 226 = 890 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 58 × 35 = 2038 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 32 × 54 = 1729 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 60 × 87 = 5220 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 816 + 635 = 1450 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 45 = 3148 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 26 × 96 = 2503 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 80 = 2408 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 57 × 22 = 1255 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 51 × 67 = 3416 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 274 + 898 = 1173 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 53 × 39 = 2073 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 84 × 20 = 1680 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 45 × 19 = 855 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 43 × 88 = 3784 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 31 × 93 = 2878 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 24 = 2352 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 69 = 1449 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 58 × 78 = 4524 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 49 × 36 = 1770 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 93 = 5487 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 265 + 920 = 1187 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 401 + 303 = 707 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 885 + 974 = 1859 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 76 × 39 = 2964 right or wrong? (a) Right (b) Wrong

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