Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 691 · 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 67 × 94 = 6298 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 518 + 591 = 1114 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 18 × 15 = 270 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 659 + 558 = 1217 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 91 × 58 = 5281 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 622 + 135 = 761 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 744 + 319 = 1063 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 982 + 372 = 1350 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 32 = 576 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 44 × 72 = 3166 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 281 + 137 = 418 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 417 + 300 = 713 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 66 × 98 = 6463 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 105 + 841 = 947 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 856 + 262 = 1122 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 20 × 73 = 1462 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 64 × 94 = 6016 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 51 = 1424 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 945 + 563 = 1508 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 764 + 607 = 1376 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 12 = 324 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 80 × 12 = 960 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 773 + 117 = 890 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 641 + 967 = 1603 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 79 × 18 = 1413 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 75 × 20 = 1500 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 425 + 330 = 764 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 176 + 124 = 308 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 63 × 81 = 5103 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 457 + 364 = 821 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 76 × 77 = 5852 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 80 = 2560 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 42 × 72 = 3017 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 297 + 801 = 1098 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 977 + 515 = 1494 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 46 × 74 = 3404 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 80 = 1200 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 93 = 1488 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 763 + 729 = 1492 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 69 × 85 = 5865 right or wrong? (a) Wrong (b) Right

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