Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 142 · 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 99 × 97 = 9603 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 323 + 207 = 533 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 49 × 55 = 2704 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 73 × 87 = 6351 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 971 + 560 = 1534 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 500 + 419 = 928 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 177 + 393 = 570 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 353 + 668 = 1021 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 161 + 556 = 717 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 96 × 29 = 2784 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 788 + 814 = 1602 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 14 × 85 = 1184 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 35 × 68 = 2372 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 801 + 187 = 988 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 66 = 1518 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 14 × 72 = 1008 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 85 × 67 = 5702 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 676 + 834 = 1510 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 518 + 220 = 738 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 12 × 61 = 732 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 66 × 34 = 2249 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 25 × 78 = 1950 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 19 × 80 = 1520 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 74 × 82 = 6068 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 84 = 4704 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 902 + 950 = 1851 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 210 + 353 = 555 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 399 + 711 = 1104 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 30 × 85 = 2552 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 56 = 3027 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 395 + 973 = 1368 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 231 + 215 = 447 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 142 + 481 = 623 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 766 + 907 = 1673 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 72 × 22 = 1584 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 274 + 231 = 505 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 553 + 796 = 1355 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 349 + 994 = 1343 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 129 + 501 = 624 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 223 + 146 = 369 right or wrong? (a) Wrong (b) Right

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