Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 953 · 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 296 + 520 = 824 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 806 + 665 = 1478 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 614 + 150 = 764 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 81 × 28 = 2271 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 30 × 20 = 591 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 96 × 39 = 3744 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 47 × 35 = 1654 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 38 × 83 = 3157 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 37 × 20 = 736 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 73 × 72 = 5265 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 78 × 69 = 5374 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 54 × 37 = 1998 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 202 + 328 = 528 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 78 × 16 = 1249 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 29 × 51 = 1479 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 742 + 810 = 1547 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 34 = 811 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 205 + 194 = 399 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 677 + 771 = 1448 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 35 × 64 = 2240 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 41 × 74 = 3038 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 31 × 33 = 1017 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 15 × 98 = 1470 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 60 × 19 = 1148 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 646 + 363 = 1009 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 23 × 96 = 2208 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 65 = 5330 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 57 = 1767 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 60 = 4380 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 207 + 690 = 897 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 76 × 27 = 2048 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 73 × 64 = 4672 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 602 + 883 = 1485 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 250 + 263 = 513 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 685 + 174 = 859 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 59 = 1351 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 65 × 45 = 2925 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 208 + 511 = 719 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 93 × 75 = 6975 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 39 × 97 = 3783 right or wrong? (a) Wrong (b) Right

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