Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 285 · 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 61 × 36 = 2196 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 406 + 606 = 1012 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 81 × 36 = 2914 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 654 + 648 = 1294 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 252 + 419 = 671 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 65 × 53 = 3445 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 65 × 25 = 1623 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 41 × 24 = 981 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 18 × 55 = 983 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 209 + 447 = 651 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 88 × 15 = 1320 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 574 + 828 = 1402 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 88 = 2376 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 381 + 308 = 689 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 705 + 207 = 914 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 259 + 614 = 873 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 640 + 281 = 925 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 192 + 251 = 443 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 87 × 98 = 8521 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 55 × 91 = 5005 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 98 × 52 = 5098 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 727 + 676 = 1407 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 683 + 908 = 1595 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 50 × 87 = 4350 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 440 + 794 = 1234 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 82 = 2878 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 88 × 52 = 4576 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 31 × 33 = 1023 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 66 × 25 = 1650 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 248 + 666 = 920 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 238 + 804 = 1037 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 84 × 87 = 7308 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 240 + 219 = 459 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 345 + 730 = 1075 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 67 × 31 = 2077 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 28 × 34 = 952 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 686 + 268 = 958 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 36 × 94 = 3384 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 93 × 30 = 2787 right or wrong? (a) Right (b) Wrong

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