Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 807 · 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 856 + 496 = 1352 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 15 × 57 = 855 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 725 + 377 = 1102 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 303 + 192 = 495 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 806 + 994 = 1802 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 333 + 962 = 1295 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 14 × 78 = 1092 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 90 × 30 = 2700 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 472 + 585 = 1061 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 58 × 44 = 2552 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 91 × 30 = 2734 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 87 × 69 = 6003 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 22 × 31 = 682 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 16 × 83 = 1328 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 370 + 817 = 1187 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 72 × 44 = 3168 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 506 + 630 = 1133 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 571 + 164 = 744 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 17 × 32 = 544 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 43 × 41 = 1763 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 77 × 50 = 3846 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 255 + 920 = 1175 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 255 + 166 = 413 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 24 × 99 = 2367 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 18 × 21 = 378 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 247 + 616 = 869 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 293 + 520 = 813 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 957 + 919 = 1876 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 47 × 91 = 4274 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 87 = 2262 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 869 + 925 = 1796 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 431 + 152 = 585 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 855 + 470 = 1325 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 450 + 510 = 967 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 22 × 67 = 1474 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 82 × 66 = 5412 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 70 × 98 = 6863 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 85 × 64 = 5440 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 795 + 494 = 1289 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 24 × 42 = 1015 right or wrong? (a) Wrong (b) Right

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