Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 469 · 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 335 + 750 = 1091 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 707 + 928 = 1635 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 40 × 84 = 3369 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 52 × 17 = 884 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 61 × 42 = 2562 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 915 + 422 = 1337 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 57 × 79 = 4503 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 12 × 64 = 767 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 23 × 37 = 857 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 65 × 60 = 3900 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 68 × 55 = 3740 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 36 = 936 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 14 × 70 = 972 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 77 × 40 = 3081 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 530 + 296 = 826 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 366 + 283 = 651 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 18 × 31 = 564 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 63 × 53 = 3341 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 917 + 463 = 1386 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 15 × 62 = 923 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 38 × 88 = 3338 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 493 + 959 = 1450 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 700 + 890 = 1590 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 99 × 29 = 2871 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 593 + 272 = 865 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 13 × 47 = 617 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 646 + 154 = 807 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 165 + 251 = 409 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 779 + 123 = 902 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 31 = 3069 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 69 = 3519 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 381 + 450 = 831 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 73 × 38 = 2771 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 25 × 54 = 1350 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 58 × 72 = 4176 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 38 × 72 = 2736 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 18 × 36 = 642 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 359 + 917 = 1276 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 15 × 42 = 633 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 17 × 52 = 884 right or wrong? (a) Right (b) Wrong

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