Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 361 · 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 21 × 35 = 735 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 523 + 256 = 779 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 144 + 361 = 501 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 360 + 399 = 759 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 17 × 84 = 1428 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 114 + 320 = 434 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 34 = 922 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 952 + 743 = 1695 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 514 + 321 = 827 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 38 × 94 = 3574 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 282 + 191 = 470 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 28 × 69 = 1932 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 431 + 590 = 1013 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 54 × 48 = 2592 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 233 + 760 = 997 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 45 × 56 = 2523 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 38 × 14 = 533 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 344 + 517 = 861 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 442 + 915 = 1354 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 356 + 492 = 842 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 83 × 49 = 4067 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 196 + 504 = 700 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 96 × 80 = 7688 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 747 + 255 = 1002 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 61 × 74 = 4514 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 12 × 24 = 286 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 34 × 68 = 2314 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 32 × 75 = 2400 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 18 × 50 = 900 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 47 × 95 = 4467 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 38 × 52 = 1976 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 734 + 664 = 1398 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 47 = 987 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 248 + 325 = 580 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 390 + 274 = 661 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 53 × 83 = 4399 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 72 × 39 = 2808 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 77 × 20 = 1540 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 48 × 33 = 1584 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 95 × 97 = 9215 right or wrong? (a) Right (b) Wrong

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