Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 780 · 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 34 × 52 = 1765 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 63 × 13 = 820 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 31 × 77 = 2388 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 73 = 2267 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 262 + 666 = 928 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 43 × 31 = 1333 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 822 + 255 = 1070 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 745 + 168 = 911 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 88 × 33 = 2898 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 679 + 590 = 1269 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 58 × 77 = 4466 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 12 × 28 = 336 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 37 × 43 = 1591 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 43 × 46 = 1978 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 36 × 53 = 1907 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 495 + 333 = 836 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 33 = 654 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 62 × 54 = 3348 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 993 + 658 = 1646 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 62 × 44 = 2728 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 362 + 828 = 1183 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 883 + 661 = 1544 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 41 × 25 = 1025 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 22 × 23 = 506 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 307 + 594 = 901 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 31 × 96 = 2968 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 271 + 745 = 1010 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 61 = 5246 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 71 × 26 = 1846 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 41 × 49 = 2009 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 262 + 363 = 626 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 257 + 257 = 514 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 406 + 409 = 815 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 79 × 14 = 1107 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 720 + 757 = 1483 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 37 × 33 = 1221 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 66 = 3102 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 151 + 590 = 739 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 558 + 937 = 1495 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 421 + 342 = 763 right or wrong? (a) Wrong (b) Right

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