Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 134 · 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 454 + 272 = 726 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 393 + 908 = 1300 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 60 × 57 = 3420 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 57 × 37 = 2109 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 250 + 753 = 1005 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 65 = 4429 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 506 + 867 = 1373 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 921 + 731 = 1652 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 464 + 712 = 1176 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 71 × 66 = 4686 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 23 × 34 = 790 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 232 + 146 = 378 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 654 + 676 = 1333 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 22 × 64 = 1416 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 38 = 2881 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 275 + 342 = 617 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 66 × 67 = 4422 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 23 × 58 = 1326 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 40 = 2600 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 98 × 78 = 7640 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 793 + 175 = 968 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 209 + 311 = 519 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 393 + 110 = 505 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 90 × 88 = 7924 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 48 × 66 = 3177 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 887 + 499 = 1383 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 96 = 6048 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 34 × 67 = 2271 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 132 + 507 = 630 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 916 + 619 = 1528 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 47 × 64 = 3008 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 507 + 951 = 1458 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 23 × 86 = 1978 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 35 × 53 = 1855 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 389 + 221 = 610 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 194 + 988 = 1182 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 329 + 297 = 626 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 954 + 577 = 1533 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 64 × 84 = 5381 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 238 + 431 = 663 right or wrong? (a) Wrong (b) Right

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