Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 418 · 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 24 × 15 = 360 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 35 = 3386 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 28 = 923 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 711 + 395 = 1114 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 63 × 94 = 5915 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 26 × 24 = 623 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 18 = 400 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 384 + 299 = 683 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 245 + 839 = 1084 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 241 + 516 = 757 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 92 × 51 = 4692 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 399 + 621 = 1014 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 510 + 918 = 1420 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 403 + 459 = 862 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 89 × 86 = 7658 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 346 + 501 = 847 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 71 × 42 = 2977 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 544 + 727 = 1278 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 775 + 635 = 1410 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 266 + 147 = 407 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 62 × 48 = 2976 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 88 × 96 = 8448 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 90 × 52 = 4680 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 122 + 128 = 250 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 19 × 35 = 665 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 846 + 361 = 1207 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 603 + 437 = 1040 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 65 × 12 = 780 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 16 × 52 = 838 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 408 + 966 = 1374 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 539 + 687 = 1226 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 52 × 14 = 728 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 833 + 580 = 1422 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 132 + 491 = 623 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 44 × 22 = 969 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 591 + 681 = 1272 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 71 × 16 = 1136 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 55 × 94 = 5170 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 984 + 733 = 1717 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 48 = 2160 right or wrong? (a) Right (b) Wrong

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