Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 415 · 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 469 + 187 = 657 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 25 × 66 = 1643 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 145 + 345 = 487 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 97 = 3103 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 59 × 67 = 3953 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 467 + 558 = 1026 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 42 × 34 = 1428 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 99 × 46 = 4554 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 98 × 55 = 5390 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 35 × 95 = 3328 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 57 × 34 = 1934 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 262 + 781 = 1045 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 701 + 582 = 1279 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 47 × 73 = 3432 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 13 = 988 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 81 × 23 = 1863 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 19 × 56 = 1063 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 93 × 15 = 1395 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 156 + 594 = 750 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 151 + 293 = 437 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 815 + 158 = 973 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 19 × 49 = 925 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 53 × 50 = 2649 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 698 + 640 = 1334 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 41 × 14 = 574 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 416 + 894 = 1310 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 223 + 831 = 1054 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 64 × 81 = 5179 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 269 + 837 = 1106 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 922 + 368 = 1290 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 83 × 69 = 5727 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 62 × 50 = 3100 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 254 + 630 = 878 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 384 + 645 = 1031 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 107 + 116 = 223 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 38 × 24 = 912 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 75 × 52 = 3900 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 713 + 243 = 954 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 70 = 1471 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 637 + 481 = 1118 right or wrong? (a) Wrong (b) Right

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