Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 812 · 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 82 × 75 = 6150 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 94 × 50 = 4692 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 82 × 63 = 5161 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 353 + 452 = 797 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 25 × 45 = 1123 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 87 = 2871 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 569 + 293 = 862 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 13 × 42 = 546 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 902 + 582 = 1484 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 35 × 62 = 2170 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 777 + 431 = 1203 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 47 × 83 = 3904 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 301 + 228 = 537 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 296 + 805 = 1101 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 47 × 12 = 556 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 77 × 18 = 1386 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 943 + 894 = 1837 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 31 × 70 = 2162 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 72 × 16 = 1152 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 740 + 283 = 1025 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 220 + 602 = 831 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 14 × 66 = 923 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 76 × 12 = 912 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 26 = 1664 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 319 + 466 = 785 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 966 + 842 = 1808 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 56 × 83 = 4648 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 121 + 662 = 782 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 358 + 667 = 1030 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 34 × 33 = 1116 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 298 + 196 = 494 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 94 = 3007 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 376 + 608 = 986 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 250 + 332 = 582 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 49 × 50 = 2450 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 88 × 19 = 1667 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 76 × 91 = 6908 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 25 × 98 = 2450 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 488 + 861 = 1349 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 37 = 444 right or wrong? (a) Right (b) Wrong

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