Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 551 · 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 66 × 40 = 2643 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 968 + 245 = 1213 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 349 + 134 = 474 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 27 = 2592 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 546 + 939 = 1483 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 42 × 79 = 3318 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 148 + 438 = 590 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 688 + 796 = 1480 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 406 + 134 = 540 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 515 + 750 = 1265 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 189 + 120 = 314 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 87 × 24 = 2088 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 56 × 60 = 3360 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 393 + 757 = 1150 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 81 × 12 = 977 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 254 + 269 = 523 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 467 + 165 = 632 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 678 + 700 = 1374 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 842 + 356 = 1198 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 776 + 993 = 1771 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 969 + 236 = 1197 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 290 + 525 = 816 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 71 × 90 = 6382 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 424 + 670 = 1094 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 24 = 1416 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 477 + 428 = 905 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 93 × 63 = 5868 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 13 × 51 = 663 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 603 + 160 = 763 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 16 × 28 = 441 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 20 × 91 = 1811 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 15 × 84 = 1258 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 286 + 462 = 748 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 16 = 560 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 611 + 464 = 1072 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 80 × 46 = 3680 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 69 = 6555 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 927 + 366 = 1293 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 681 + 116 = 797 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 97 × 17 = 1649 right or wrong? (a) Wrong (b) Right

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