Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 423 · 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 67 × 84 = 5628 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 32 = 455 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 782 + 665 = 1447 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 82 = 7954 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 623 + 246 = 869 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 78 × 80 = 6231 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 12 × 93 = 1116 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 496 + 566 = 1063 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 119 + 585 = 704 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 885 + 507 = 1386 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 526 + 670 = 1194 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 34 = 3264 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 53 × 97 = 5141 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 41 × 96 = 3936 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 515 + 503 = 1018 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 18 × 58 = 1044 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 43 = 4085 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 92 × 21 = 1933 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 34 × 48 = 1632 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 399 + 143 = 534 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 582 + 748 = 1333 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 58 × 49 = 2843 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 407 + 833 = 1240 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 178 + 971 = 1144 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 213 + 558 = 765 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 53 × 88 = 4666 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 46 × 70 = 3220 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 58 × 63 = 3654 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 818 + 348 = 1166 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 85 × 90 = 7641 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 19 × 59 = 1114 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 906 + 834 = 1740 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 72 × 89 = 6408 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 67 × 82 = 5494 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 141 + 991 = 1132 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 258 + 646 = 904 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 52 = 3380 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 73 × 45 = 3288 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 81 × 74 = 5993 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 79 = 5773 right or wrong? (a) Right (b) Wrong

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