Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 411 · 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 731 + 807 = 1536 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 52 × 93 = 4845 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 31 × 39 = 1209 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 55 × 42 = 2310 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 303 + 850 = 1159 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 61 × 41 = 2501 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 78 × 62 = 4831 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 34 = 2005 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 93 × 63 = 5859 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 27 × 65 = 1762 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 92 × 20 = 1840 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 13 × 55 = 715 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 42 × 89 = 3738 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 16 × 67 = 1066 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 560 + 947 = 1507 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 709 + 234 = 943 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 993 + 981 = 1971 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 90 × 13 = 1170 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 60 × 92 = 5528 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 37 × 37 = 1374 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 924 + 909 = 1827 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 22 × 35 = 770 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 943 + 532 = 1469 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 25 × 89 = 2225 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 129 + 985 = 1114 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 689 + 161 = 844 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 280 + 122 = 402 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 625 + 730 = 1355 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 378 + 396 = 778 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 87 × 21 = 1827 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 385 + 397 = 784 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 80 = 1998 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 99 = 6534 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 124 + 791 = 920 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 68 × 27 = 1845 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 15 = 336 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 76 × 66 = 5021 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 63 × 26 = 1638 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 66 × 19 = 1254 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 253 + 298 = 551 right or wrong? (a) Wrong (b) Right

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