Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 523 · 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 427 + 618 = 1045 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 66 × 92 = 6081 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 605 + 572 = 1174 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 69 × 32 = 2211 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 63 × 39 = 2456 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 37 × 19 = 703 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 981 + 432 = 1410 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 666 + 972 = 1639 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 46 × 19 = 874 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 105 + 739 = 837 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 55 × 16 = 882 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 60 × 12 = 720 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 560 + 402 = 962 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 78 × 58 = 4524 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 89 × 30 = 2670 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 600 + 606 = 1206 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 50 × 66 = 3300 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 20 = 531 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 59 × 33 = 1944 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 232 + 628 = 861 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 13 = 398 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 109 + 900 = 1009 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 80 × 82 = 6567 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 320 + 857 = 1177 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 19 × 86 = 1634 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 141 + 561 = 702 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 29 = 2778 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 884 + 384 = 1270 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 39 × 65 = 2535 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 154 + 424 = 572 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 134 + 534 = 675 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 72 × 81 = 5832 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 44 = 880 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 595 + 773 = 1368 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 62 × 30 = 1860 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 65 × 58 = 3761 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 13 × 75 = 966 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 95 × 31 = 2949 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 638 + 586 = 1223 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 764 + 582 = 1341 right or wrong? (a) Right (b) Wrong

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