Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 960 · 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 15 × 98 = 1470 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 825 + 136 = 961 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 49 × 71 = 3486 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 56 × 29 = 1626 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 53 × 97 = 5134 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 94 × 30 = 2820 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 20 × 21 = 420 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 558 + 776 = 1331 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 698 + 121 = 827 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 30 × 26 = 773 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 55 × 83 = 4562 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 48 × 41 = 1968 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 112 + 697 = 809 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 70 × 75 = 5250 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 202 + 823 = 1025 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 151 + 147 = 298 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 27 × 72 = 1944 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 51 × 87 = 4437 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 40 × 96 = 3840 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 117 + 855 = 972 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 42 × 19 = 798 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 556 + 215 = 775 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 929 + 139 = 1075 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 31 × 95 = 2945 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 250 + 236 = 486 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 942 + 483 = 1425 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 379 + 911 = 1290 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 71 × 81 = 5751 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 414 + 431 = 850 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 41 × 31 = 1271 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 200 + 734 = 934 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 535 + 739 = 1274 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 89 × 58 = 5169 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 52 × 76 = 3959 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 50 × 19 = 950 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 87 = 1999 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 897 + 311 = 1208 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 156 + 497 = 653 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 236 + 209 = 439 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 501 + 494 = 1002 right or wrong? (a) Wrong (b) Right

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