Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 636 · 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 32 × 45 = 1440 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 81 × 99 = 8019 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 93 × 39 = 3627 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 83 × 14 = 1154 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 86 × 41 = 3526 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 66 × 46 = 3039 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 23 × 44 = 1012 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 678 + 465 = 1143 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 43 × 77 = 3311 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 171 + 219 = 395 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 98 × 66 = 6472 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 81 = 2504 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 359 + 361 = 711 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 25 = 723 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 21 × 18 = 380 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 66 × 93 = 6138 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 959 + 753 = 1712 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 317 + 345 = 659 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 14 × 20 = 287 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 66 × 96 = 6336 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 585 + 227 = 803 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 359 + 931 = 1290 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 41 × 63 = 2574 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 119 + 714 = 837 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 550 + 978 = 1528 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 45 × 84 = 3780 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 98 = 6468 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 433 + 365 = 798 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 48 × 31 = 1497 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 82 = 2298 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 358 + 469 = 823 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 392 + 502 = 892 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 495 + 206 = 701 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 15 × 59 = 880 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 63 × 36 = 2268 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 46 × 16 = 736 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 841 + 910 = 1751 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 900 + 333 = 1240 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 309 + 174 = 474 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 65 × 66 = 4292 right or wrong? (a) Right (b) Wrong

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