Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 542 · 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 946 + 202 = 1140 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 96 × 38 = 3648 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 43 × 38 = 1641 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 173 + 259 = 432 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 67 × 23 = 1541 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 76 × 54 = 4104 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 290 + 259 = 545 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 174 + 523 = 690 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 482 + 334 = 816 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 117 + 132 = 249 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 59 × 27 = 1594 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 43 × 62 = 2657 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 898 + 255 = 1153 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 888 + 261 = 1147 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 82 × 18 = 1476 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 81 × 62 = 5022 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 76 × 51 = 3876 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 155 + 455 = 610 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 81 × 56 = 4536 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 718 + 621 = 1339 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 360 + 172 = 532 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 26 × 40 = 1048 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 99 × 94 = 9313 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 871 + 274 = 1145 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 90 × 25 = 2250 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 78 × 14 = 1084 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 94 × 65 = 6101 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 36 × 64 = 2304 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 131 + 397 = 526 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 12 × 84 = 1017 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 455 + 848 = 1306 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 66 × 87 = 5742 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 86 × 62 = 5337 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 45 × 82 = 3690 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 68 × 85 = 5785 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 335 + 293 = 628 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 60 = 1744 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 797 + 583 = 1375 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 47 × 91 = 4277 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 468 + 145 = 614 right or wrong? (a) Wrong (b) Right

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