Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 709 · 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 68 × 31 = 2108 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 241 + 739 = 974 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 58 = 993 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 529 + 856 = 1388 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 838 + 503 = 1341 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 638 + 610 = 1248 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 96 = 2016 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 220 + 362 = 582 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 71 × 84 = 5970 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 12 × 83 = 996 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 90 × 99 = 8910 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 49 = 4650 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 85 × 74 = 6290 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 22 × 21 = 465 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 56 × 33 = 1853 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 279 + 245 = 524 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 562 + 807 = 1369 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 61 × 61 = 3718 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 347 + 549 = 896 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 329 + 162 = 491 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 230 + 737 = 967 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 55 × 85 = 4670 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 40 × 51 = 2044 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 525 + 661 = 1179 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 36 × 79 = 2844 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 315 + 171 = 482 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 30 = 1050 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 239 + 637 = 884 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 954 + 325 = 1279 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 40 × 17 = 685 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 551 + 166 = 717 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 73 = 7155 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 110 + 516 = 626 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 946 + 933 = 1879 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 90 × 37 = 3330 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 280 + 178 = 458 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 652 + 957 = 1609 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 55 = 1542 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 51 × 12 = 612 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 52 × 65 = 3388 right or wrong? (a) Wrong (b) Right

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