Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 605 · 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 78 × 73 = 5694 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 84 = 3112 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 74 × 27 = 1998 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 16 × 22 = 352 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 79 × 18 = 1422 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 52 × 69 = 3588 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 989 + 551 = 1540 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 153 + 233 = 380 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 547 + 511 = 1058 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 280 + 464 = 737 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 254 + 484 = 738 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 30 = 780 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 43 = 1849 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 188 + 218 = 406 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 27 × 54 = 1458 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 97 × 42 = 4065 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 96 = 9511 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 46 × 68 = 3128 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 630 + 318 = 948 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 55 × 44 = 2427 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 879 + 802 = 1672 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 40 × 63 = 2511 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 84 = 7644 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 16 × 83 = 1328 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 448 + 706 = 1154 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 132 + 108 = 240 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 70 × 42 = 2940 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 59 = 3540 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 42 × 79 = 3312 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 451 + 924 = 1376 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 653 + 548 = 1201 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 635 + 329 = 964 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 107 + 951 = 1065 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 26 × 20 = 517 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 836 + 915 = 1745 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 18 = 1314 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 48 × 48 = 2298 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 734 + 598 = 1326 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 43 × 22 = 946 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 27 × 13 = 351 right or wrong? (a) Wrong (b) Right

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