Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 54 · 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 55 × 24 = 1313 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 497 + 581 = 1078 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 25 × 50 = 1252 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 985 + 205 = 1190 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 77 × 63 = 4851 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 26 = 1924 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 78 × 74 = 5765 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 20 × 12 = 238 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 93 × 86 = 8004 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 63 = 756 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 165 + 956 = 1121 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 457 + 419 = 876 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 54 = 810 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 90 × 38 = 3420 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 59 × 77 = 4550 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 534 + 137 = 673 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 463 + 153 = 609 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 272 + 230 = 504 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 89 × 37 = 3293 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 15 × 98 = 1470 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 14 × 24 = 336 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 18 × 20 = 358 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 247 + 250 = 497 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 20 × 30 = 599 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 659 + 154 = 818 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 393 + 216 = 609 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 25 × 61 = 1521 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 74 × 83 = 6142 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 34 × 19 = 643 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 28 × 60 = 1683 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 425 + 348 = 770 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 782 + 855 = 1637 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 71 = 2619 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 127 + 354 = 481 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 435 + 115 = 545 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 261 + 841 = 1102 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 80 × 99 = 7918 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 514 + 658 = 1174 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 15 × 15 = 225 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 58 × 68 = 3935 right or wrong? (a) Right (b) Wrong

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