Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 454 · 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 449 + 535 = 989 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 89 × 26 = 2314 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 355 + 649 = 998 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 79 × 28 = 2212 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 135 + 561 = 694 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 12 × 85 = 1020 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 261 + 693 = 954 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 46 × 12 = 561 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 36 × 13 = 468 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 521 + 933 = 1454 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 335 + 734 = 1073 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 30 × 25 = 750 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 45 × 92 = 4140 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 53 = 1378 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 947 + 177 = 1115 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 173 + 480 = 649 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 171 + 751 = 922 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 676 + 316 = 995 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 704 + 744 = 1456 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 88 × 84 = 7399 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 854 + 162 = 1016 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 364 + 643 = 1004 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 247 + 875 = 1131 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 87 × 55 = 4794 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 73 × 20 = 1464 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 542 + 271 = 810 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 357 + 720 = 1084 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 84 = 2352 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 90 × 21 = 1892 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 37 = 2072 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 67 × 18 = 1206 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 45 = 985 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 561 + 599 = 1160 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 24 × 99 = 2376 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 390 + 246 = 641 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 220 + 197 = 417 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 75 × 12 = 900 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 76 × 21 = 1596 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 46 × 88 = 4042 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 704 + 794 = 1498 right or wrong? (a) Wrong (b) Right

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