Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 874 · 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 14 × 15 = 216 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 125 + 816 = 937 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 79 × 66 = 5209 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 19 × 79 = 1509 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 706 + 648 = 1354 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 411 + 226 = 630 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 322 + 509 = 831 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 731 + 812 = 1543 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 911 + 385 = 1301 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 482 + 586 = 1069 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 210 + 942 = 1161 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 135 + 662 = 797 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 192 + 793 = 985 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 972 + 715 = 1694 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 132 + 119 = 251 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 682 + 432 = 1114 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 353 + 753 = 1106 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 35 × 34 = 1190 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 669 + 837 = 1505 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 93 × 64 = 5947 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 45 = 676 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 21 × 98 = 2058 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 724 + 925 = 1649 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 178 + 513 = 688 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 322 + 542 = 864 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 46 = 4508 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 21 × 94 = 1972 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 641 + 733 = 1374 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 280 + 171 = 459 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 75 × 50 = 3750 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 91 × 78 = 7103 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 83 × 68 = 5638 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 60 × 56 = 3353 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 18 × 48 = 865 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 88 = 4752 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 86 × 17 = 1462 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 554 + 721 = 1270 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 53 = 3922 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 73 × 28 = 2048 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 38 × 19 = 714 right or wrong? (a) Wrong (b) Right

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