Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 123 · 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 272 + 243 = 523 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 748 + 276 = 1018 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 26 × 70 = 1827 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 815 + 902 = 1716 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 62 × 48 = 2976 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 65 × 18 = 1165 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 30 = 810 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 942 + 704 = 1646 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 15 × 63 = 948 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 262 + 215 = 480 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 824 + 306 = 1130 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 82 × 44 = 3608 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 278 + 165 = 443 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 20 × 99 = 1980 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 939 + 228 = 1169 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 56 × 65 = 3640 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 30 × 76 = 2273 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 590 + 780 = 1367 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 153 + 238 = 391 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 281 + 959 = 1240 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 145 + 580 = 725 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 47 × 63 = 2961 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 279 + 722 = 996 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 78 × 26 = 2028 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 26 × 65 = 1682 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 29 = 2755 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 795 + 510 = 1305 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 65 × 44 = 2860 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 16 × 25 = 400 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 62 × 69 = 4278 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 70 × 20 = 1397 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 70 × 18 = 1260 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 511 + 272 = 783 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 17 × 64 = 1090 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 86 × 20 = 1714 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 82 × 92 = 7540 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 782 + 332 = 1114 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 114 + 587 = 701 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 134 + 154 = 286 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 34 × 34 = 1158 right or wrong? (a) Right (b) Wrong

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