Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 804 · 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 316 + 611 = 927 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 45 = 1674 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 503 + 696 = 1199 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 75 × 17 = 1275 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 37 × 72 = 2664 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 99 × 66 = 6530 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 85 × 39 = 3315 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 23 × 66 = 1518 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 591 + 746 = 1332 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 988 + 572 = 1560 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 42 × 90 = 3780 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 24 × 25 = 600 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 208 + 342 = 544 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 767 + 186 = 954 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 71 × 80 = 5680 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 66 × 44 = 2904 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 414 + 513 = 927 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 541 + 694 = 1234 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 876 + 728 = 1606 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 631 + 371 = 1002 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 63 × 35 = 2199 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 222 + 801 = 1023 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 70 × 80 = 5600 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 52 × 54 = 2808 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 76 × 98 = 7448 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 799 + 509 = 1303 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 60 × 24 = 1440 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 767 + 481 = 1244 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 31 × 24 = 744 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 36 × 91 = 3283 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 60 × 61 = 3652 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 984 + 515 = 1499 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 97 = 9020 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 300 + 449 = 749 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 392 + 994 = 1389 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 15 × 62 = 927 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 57 × 37 = 2109 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 49 × 56 = 2744 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 175 + 691 = 863 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 216 + 446 = 667 right or wrong? (a) Right (b) Wrong

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