Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 451 · 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 499 + 175 = 667 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 12 × 23 = 270 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 921 + 989 = 1905 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 759 + 366 = 1131 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 58 × 36 = 2082 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 33 × 38 = 1254 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 126 + 801 = 923 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 197 + 258 = 455 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 943 + 644 = 1587 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 35 = 770 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 94 × 15 = 1404 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 250 + 611 = 861 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 455 + 483 = 938 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 174 + 862 = 1027 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 52 × 98 = 5096 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 37 = 888 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 72 × 19 = 1371 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 853 + 233 = 1078 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 127 + 486 = 613 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 80 × 13 = 1034 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 972 + 513 = 1485 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 42 = 3147 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 516 + 511 = 1020 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 78 × 80 = 6239 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 38 × 79 = 3002 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 231 + 778 = 1009 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 33 × 36 = 1188 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 178 + 287 = 464 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 709 + 887 = 1603 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 373 + 265 = 630 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 121 + 207 = 328 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 15 × 34 = 513 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 94 × 17 = 1598 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 59 × 57 = 3362 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 60 × 85 = 5099 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 98 × 53 = 5194 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 16 × 40 = 640 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 275 + 344 = 622 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 22 × 71 = 1565 right or wrong? (a) Wrong (b) Right

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