Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 715 · 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 13 × 48 = 622 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 33 × 50 = 1650 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 80 × 92 = 7360 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 216 + 655 = 871 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 41 × 29 = 1195 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 94 = 5828 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 136 + 196 = 332 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 41 × 61 = 2501 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 66 × 70 = 4620 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 463 + 294 = 766 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 26 × 86 = 2229 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 17 × 18 = 301 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 50 × 81 = 4050 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 25 × 35 = 875 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 246 + 712 = 958 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 152 + 175 = 327 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 241 + 921 = 1164 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 22 × 55 = 1210 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 112 + 127 = 234 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 691 + 523 = 1214 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 213 + 371 = 590 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 382 + 110 = 492 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 74 × 41 = 3025 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 448 + 655 = 1102 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 71 × 98 = 6967 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 536 + 840 = 1376 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 19 = 996 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 937 + 112 = 1049 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 204 + 262 = 466 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 398 + 380 = 773 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 55 × 43 = 2365 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 93 × 91 = 8463 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 40 × 20 = 800 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 56 × 50 = 2807 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 61 = 4091 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 57 × 94 = 5356 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 94 = 7423 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 937 + 779 = 1709 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 613 + 248 = 861 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 94 = 2350 right or wrong? (a) Wrong (b) Right

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