Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 704 · 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 276 + 406 = 682 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 82 × 65 = 5330 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 69 × 92 = 6353 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 196 + 338 = 525 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 22 × 76 = 1672 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 586 + 763 = 1354 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 86 × 77 = 6622 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 353 + 969 = 1322 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 39 × 90 = 3510 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 49 × 18 = 882 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 365 + 223 = 582 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 332 + 788 = 1115 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 47 × 44 = 2068 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 51 × 74 = 3776 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 806 + 957 = 1763 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 19 × 81 = 1538 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 780 + 205 = 984 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 985 + 633 = 1616 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 174 + 900 = 1074 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 57 = 4965 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 277 + 841 = 1118 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 294 + 786 = 1089 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 918 + 194 = 1112 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 183 + 289 = 480 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 983 + 263 = 1246 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 32 × 65 = 2080 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 106 + 280 = 386 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 869 + 537 = 1398 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 761 + 890 = 1651 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 30 × 16 = 480 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 23 × 26 = 598 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 38 = 1064 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 88 × 35 = 3080 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 66 × 19 = 1251 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 44 × 45 = 1980 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 994 + 668 = 1661 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 40 × 18 = 721 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 711 + 243 = 951 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 79 = 7742 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 64 × 39 = 2496 right or wrong? (a) Right (b) Wrong

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