Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 757 · 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 824 + 620 = 1444 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 97 = 9215 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 693 + 639 = 1332 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 759 + 960 = 1719 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 449 + 820 = 1269 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 278 + 471 = 749 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 83 × 82 = 6798 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 77 × 78 = 6006 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 26 × 98 = 2548 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 31 × 68 = 2108 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 88 × 86 = 7568 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 71 × 65 = 4615 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 623 + 703 = 1326 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 80 × 65 = 5202 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 375 + 724 = 1099 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 904 + 367 = 1279 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 63 × 85 = 5355 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 412 + 590 = 1002 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 506 + 397 = 903 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 85 × 68 = 5776 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 48 × 45 = 2169 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 376 + 591 = 967 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 983 + 207 = 1190 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 564 + 666 = 1230 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 313 + 973 = 1287 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 99 × 44 = 4356 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 692 + 477 = 1169 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 496 + 532 = 1028 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 93 × 84 = 7812 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 89 = 2314 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 91 = 1914 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 79 × 63 = 4970 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 641 + 377 = 1018 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 15 = 420 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 660 + 973 = 1633 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 303 + 343 = 639 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 77 × 26 = 2002 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 56 × 91 = 5096 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 889 + 931 = 1820 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 310 + 416 = 725 right or wrong? (a) Wrong (b) Right

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