Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 999 · 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 13 × 37 = 481 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 849 + 235 = 1084 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 26 × 30 = 780 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 65 × 23 = 1495 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 75 = 3892 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 149 + 270 = 423 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 294 + 730 = 1024 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 79 × 28 = 2215 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 958 + 556 = 1512 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 95 × 58 = 5510 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 832 + 276 = 1100 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 90 × 18 = 1627 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 930 + 171 = 1101 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 76 × 67 = 5092 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 821 + 888 = 1709 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 405 + 732 = 1137 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 43 × 93 = 3999 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 22 × 74 = 1628 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 249 + 445 = 688 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 77 × 95 = 7306 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 498 + 280 = 778 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 119 + 385 = 499 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 799 + 821 = 1620 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 99 × 87 = 8619 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 40 = 2352 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 518 + 436 = 954 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 88 × 62 = 5456 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 88 × 52 = 4571 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 47 × 33 = 1549 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 42 = 710 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 489 + 952 = 1441 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 90 = 2254 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 998 + 503 = 1501 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 833 + 968 = 1801 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 64 × 17 = 1097 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 483 + 241 = 724 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 374 + 268 = 642 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 722 + 489 = 1211 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 886 + 931 = 1816 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 22 × 86 = 1892 right or wrong? (a) Right (b) Wrong

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