Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 958 · 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 261 + 260 = 521 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 712 + 965 = 1671 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 867 + 671 = 1547 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 16 × 30 = 480 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 534 + 855 = 1389 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 322 + 181 = 503 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 17 × 84 = 1430 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 92 × 75 = 6905 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 39 × 63 = 2457 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 20 = 1600 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 962 + 562 = 1529 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 670 + 490 = 1155 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 49 = 4557 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 69 × 24 = 1656 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 66 × 88 = 5809 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 836 + 399 = 1235 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 888 + 333 = 1223 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 378 + 451 = 829 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 19 × 88 = 1674 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 26 = 1716 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 169 + 675 = 844 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 45 × 33 = 1476 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 163 + 409 = 572 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 17 × 50 = 850 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 97 × 21 = 2045 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 413 + 622 = 1035 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 55 × 75 = 4125 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 44 = 4044 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 89 × 32 = 2848 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 671 + 657 = 1331 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 335 + 636 = 971 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 12 × 74 = 887 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 75 × 20 = 1500 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 21 × 91 = 1912 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 962 + 425 = 1387 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 85 × 54 = 4581 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 919 + 282 = 1203 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 91 × 21 = 1911 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 146 + 291 = 437 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 526 + 166 = 692 right or wrong? (a) Right (b) Wrong

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