Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 414 · 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 863 + 962 = 1825 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 231 + 249 = 480 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 47 × 69 = 3239 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 71 × 35 = 2493 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 729 + 260 = 992 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 58 × 13 = 752 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 76 × 93 = 7068 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 33 × 18 = 592 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 61 × 37 = 2253 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 626 + 948 = 1574 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 263 + 846 = 1107 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 555 + 387 = 942 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 58 × 32 = 1856 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 475 + 894 = 1369 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 525 + 476 = 1001 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 59 × 99 = 5841 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 29 × 70 = 2030 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 352 + 365 = 718 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 556 + 463 = 1019 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 74 × 71 = 5254 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 61 × 30 = 1830 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 106 + 533 = 639 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 45 = 1437 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 15 × 49 = 735 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 423 + 213 = 643 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 464 + 769 = 1242 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 188 + 994 = 1182 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 975 + 974 = 1949 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 51 × 67 = 3417 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 75 = 7425 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 72 × 74 = 5320 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 131 + 266 = 393 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 689 + 363 = 1052 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 881 + 930 = 1818 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 428 + 893 = 1315 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 92 × 98 = 9016 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 28 × 72 = 2016 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 756 + 496 = 1252 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 143 + 106 = 255 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 400 + 659 = 1058 right or wrong? (a) Right (b) Wrong

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