Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 263 · 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 338 + 138 = 474 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 93 = 5022 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 620 + 745 = 1365 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 540 + 117 = 657 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 259 + 638 = 897 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 31 × 77 = 2395 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 14 = 294 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 79 × 88 = 6952 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 50 = 1494 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 76 × 21 = 1596 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 112 + 971 = 1081 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 888 + 456 = 1336 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 69 × 18 = 1241 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 67 × 23 = 1546 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 72 × 49 = 3527 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 182 + 685 = 867 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 90 = 5310 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 834 + 732 = 1566 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 44 × 32 = 1408 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 59 × 16 = 947 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 88 × 46 = 4046 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 212 + 565 = 777 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 60 × 40 = 2408 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 47 × 33 = 1556 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 53 × 33 = 1751 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 162 + 190 = 352 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 844 + 956 = 1802 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 51 × 57 = 2905 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 874 + 727 = 1601 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 93 × 22 = 2046 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 603 + 367 = 967 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 123 + 985 = 1102 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 13 × 85 = 1105 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 378 + 863 = 1238 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 229 + 304 = 526 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 14 × 76 = 1064 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 292 + 199 = 492 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 58 × 12 = 696 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 19 = 1387 right or wrong? (a) Right (b) Wrong

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