Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 138 · 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 290 + 595 = 882 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 72 × 97 = 6984 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 86 × 76 = 6536 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 34 × 57 = 1938 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 67 × 16 = 1065 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 343 + 263 = 606 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 17 × 94 = 1603 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 42 × 68 = 2854 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 71 × 17 = 1201 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 92 × 87 = 8003 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 58 × 69 = 4002 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 46 × 37 = 1702 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 51 = 3927 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 240 + 873 = 1113 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 19 × 31 = 585 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 47 × 26 = 1214 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 76 × 24 = 1820 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 532 + 623 = 1157 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 397 + 733 = 1129 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 18 × 70 = 1260 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 38 × 77 = 2932 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 212 + 539 = 751 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 71 = 2557 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 602 + 909 = 1511 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 153 + 279 = 437 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 522 + 891 = 1416 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 21 × 74 = 1562 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 372 + 975 = 1347 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 819 + 699 = 1518 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 321 + 353 = 674 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 176 + 560 = 736 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 176 + 309 = 485 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 862 + 492 = 1350 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 51 × 24 = 1225 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 68 = 5644 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 92 × 63 = 5796 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 434 + 533 = 967 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 441 + 846 = 1288 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 659 + 201 = 860 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 688 + 476 = 1162 right or wrong? (a) Right (b) Wrong

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