Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 981 · 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 314 + 795 = 1114 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 36 × 67 = 2412 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 968 + 309 = 1281 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 26 × 38 = 988 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 998 + 225 = 1230 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 763 + 140 = 896 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 50 × 62 = 3109 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 74 = 1397 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 90 × 67 = 6030 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 99 = 9207 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 60 × 28 = 1677 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 90 × 74 = 6660 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 145 + 392 = 539 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 589 + 820 = 1409 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 69 × 39 = 2697 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 43 × 69 = 2967 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 77 × 62 = 4774 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 233 + 243 = 475 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 24 × 75 = 1791 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 26 × 85 = 2210 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 774 + 501 = 1275 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 83 × 68 = 5636 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 94 × 95 = 8931 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 23 × 79 = 1817 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 912 + 636 = 1548 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 375 + 888 = 1260 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 974 + 669 = 1643 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 79 × 31 = 2440 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 748 + 700 = 1449 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 740 + 303 = 1047 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 60 × 41 = 2467 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 26 × 64 = 1669 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 952 + 675 = 1633 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 83 = 3071 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 43 × 97 = 4171 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 234 + 127 = 362 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 85 × 94 = 7990 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 492 + 942 = 1434 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 843 + 176 = 1013 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 834 + 392 = 1221 right or wrong? (a) Right (b) Wrong

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