Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 744 · 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 230 + 332 = 562 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 44 × 99 = 4356 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 84 × 71 = 5964 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 414 + 511 = 933 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 79 × 85 = 6715 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 634 + 552 = 1186 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 67 × 38 = 2543 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 58 × 59 = 3416 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 73 × 54 = 3942 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 229 + 294 = 523 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 739 + 570 = 1309 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 827 + 228 = 1063 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 540 + 526 = 1066 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 179 + 129 = 306 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 42 × 12 = 496 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 214 + 403 = 611 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 27 × 39 = 1049 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 664 + 486 = 1152 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 44 = 1408 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 112 + 218 = 330 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 387 + 534 = 921 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 32 × 32 = 1024 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 997 + 555 = 1552 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 340 + 863 = 1205 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 22 × 13 = 286 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 586 + 345 = 931 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 28 = 560 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 89 × 56 = 4975 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 39 × 49 = 1911 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 885 + 141 = 1026 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 275 + 813 = 1086 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 182 + 920 = 1094 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 350 + 909 = 1259 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 55 × 74 = 4070 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 99 × 77 = 7623 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 748 + 142 = 887 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 508 + 795 = 1303 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 879 + 707 = 1586 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 239 + 930 = 1169 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Right (b) Wrong

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