Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 193 · 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 762 + 810 = 1580 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 29 = 580 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 42 = 1381 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 15 × 94 = 1405 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 133 + 285 = 418 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 31 × 27 = 843 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 13 × 24 = 312 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 34 × 96 = 3268 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 130 + 915 = 1045 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 98 × 60 = 5879 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 22 × 78 = 1716 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 115 + 756 = 865 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 639 + 486 = 1125 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 408 + 169 = 577 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 76 × 90 = 6840 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 83 = 2324 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 88 × 61 = 5368 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 34 × 63 = 2135 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 112 + 343 = 455 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 943 + 219 = 1160 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 12 × 43 = 516 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 42 × 44 = 1841 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 57 × 72 = 4104 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 23 × 12 = 271 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 787 + 241 = 1037 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 227 + 128 = 355 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 40 × 76 = 3040 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 97 = 7084 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 50 × 70 = 3500 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 65 × 44 = 2853 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 19 × 64 = 1211 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 68 = 1763 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 494 + 545 = 1039 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 14 × 80 = 1120 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 12 × 15 = 180 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 862 + 243 = 1105 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 69 = 1104 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 93 × 37 = 3435 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 98 × 74 = 7261 right or wrong? (a) Right (b) Wrong

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