Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 426 · 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 891 + 581 = 1472 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 482 + 345 = 829 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 527 + 194 = 721 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 410 + 994 = 1404 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 66 × 27 = 1782 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 83 = 1571 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 405 + 448 = 859 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 328 + 488 = 808 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 96 = 2018 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 246 + 815 = 1061 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 27 × 68 = 1836 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 98 × 77 = 7546 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 76 × 58 = 4408 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 165 + 942 = 1116 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 35 = 2765 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 31 × 52 = 1603 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 884 + 499 = 1383 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 30 × 51 = 1532 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 550 + 259 = 805 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 74 × 31 = 2294 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 743 + 726 = 1469 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 994 + 521 = 1515 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 742 + 281 = 1023 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 710 + 414 = 1125 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 25 × 92 = 2299 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 318 + 876 = 1194 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 78 = 4992 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 714 + 953 = 1667 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 224 + 799 = 1023 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 487 + 499 = 995 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 27 × 35 = 941 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 18 × 72 = 1296 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 54 × 99 = 5350 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 931 + 604 = 1532 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 98 × 38 = 3732 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 12 × 28 = 336 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 328 + 202 = 521 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 26 × 92 = 2392 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 88 × 25 = 2195 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 20 × 97 = 1940 right or wrong? (a) Wrong (b) Right

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