Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 887 · 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 95 × 70 = 6659 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 74 × 93 = 6882 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 429 + 119 = 541 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 22 × 85 = 1876 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 987 + 207 = 1201 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 12 × 59 = 707 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 555 + 157 = 710 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 80 × 39 = 3127 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 27 × 31 = 837 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 58 × 66 = 3828 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 335 + 764 = 1091 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 19 × 51 = 969 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 16 × 45 = 720 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 128 + 192 = 320 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 189 + 659 = 851 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 893 + 819 = 1718 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 891 + 117 = 1008 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 995 + 822 = 1817 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 35 × 73 = 2555 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 46 × 82 = 3772 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 928 + 567 = 1492 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 87 = 1563 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 83 × 54 = 4481 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 89 × 31 = 2764 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 737 + 594 = 1333 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 317 + 283 = 592 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 89 × 64 = 5701 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 47 × 92 = 4324 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 979 + 637 = 1616 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 14 × 44 = 625 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 20 × 84 = 1680 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 36 × 86 = 3096 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 854 + 637 = 1491 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 71 × 27 = 1917 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 561 + 628 = 1189 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 34 × 74 = 2516 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 72 × 45 = 3240 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 581 + 438 = 1019 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 91 = 6552 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 855 + 409 = 1268 right or wrong? (a) Right (b) Wrong

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