Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 879 · 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 55 × 97 = 5335 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 350 + 178 = 528 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 44 × 82 = 3611 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 34 = 1964 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 37 × 12 = 444 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 274 + 550 = 824 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 34 × 18 = 612 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 42 × 92 = 3864 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 733 + 870 = 1604 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 95 × 82 = 7790 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 677 + 519 = 1196 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 814 + 728 = 1540 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 34 × 32 = 1082 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 209 + 361 = 570 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 36 × 13 = 468 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 371 + 151 = 516 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 255 + 567 = 822 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 57 × 93 = 5299 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 681 + 867 = 1554 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 746 + 476 = 1222 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 33 × 88 = 2896 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 874 + 197 = 1069 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 68 × 16 = 1083 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 53 × 97 = 5141 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 14 = 173 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 40 × 91 = 3645 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 53 = 3499 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 14 × 39 = 546 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 919 + 674 = 1584 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 22 × 72 = 1586 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 33 = 2871 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 92 × 20 = 1840 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 89 × 95 = 8455 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 380 + 675 = 1055 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 20 × 18 = 362 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 22 × 86 = 1892 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 69 × 76 = 5239 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 45 × 36 = 1625 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 26 × 90 = 2340 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 306 + 752 = 1061 right or wrong? (a) Right (b) Wrong

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