Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 930 · 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 58 × 91 = 5278 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 790 + 273 = 1062 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 422 + 869 = 1292 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 624 + 501 = 1125 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 288 + 172 = 451 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 88 × 56 = 4928 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 42 × 22 = 924 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 38 × 87 = 3306 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 787 + 184 = 971 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 42 × 87 = 3650 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 495 + 258 = 753 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 13 = 195 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 255 + 139 = 394 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 59 × 72 = 4248 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 75 = 5925 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 110 + 401 = 518 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 519 + 701 = 1221 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 309 + 281 = 585 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 483 + 240 = 720 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 264 + 994 = 1265 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 943 + 187 = 1130 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 855 + 680 = 1535 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 953 + 328 = 1281 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 265 + 294 = 559 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 30 × 66 = 1973 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 53 × 46 = 2438 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 84 × 45 = 3789 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 39 = 2379 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 418 + 111 = 522 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 142 + 899 = 1043 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 982 + 982 = 1968 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 84 × 34 = 2852 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 63 × 47 = 2961 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 13 × 24 = 311 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 78 = 7407 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 46 × 19 = 874 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 649 + 844 = 1493 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 991 + 290 = 1281 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 40 × 99 = 3965 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 89 × 96 = 8545 right or wrong? (a) Right (b) Wrong

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