Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 103 · 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 42 × 19 = 798 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 83 × 60 = 4980 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 272 + 615 = 896 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 168 + 402 = 570 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 22 × 63 = 1387 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 914 + 993 = 1907 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 704 + 359 = 1061 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 873 + 336 = 1200 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 64 × 34 = 2171 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 740 + 644 = 1384 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 54 × 52 = 2816 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 96 × 91 = 8736 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 78 × 68 = 5307 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 556 + 176 = 727 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 91 × 45 = 4095 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 634 + 258 = 892 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 24 = 358 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 697 + 120 = 817 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 14 × 21 = 299 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 34 = 1258 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 234 + 480 = 714 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 78 = 1326 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 958 + 845 = 1803 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 44 × 45 = 1972 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 310 + 499 = 809 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 124 + 785 = 909 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 40 = 800 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 34 × 87 = 2958 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 148 + 373 = 521 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 82 × 68 = 5578 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 88 × 27 = 2376 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 89 × 99 = 8803 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 278 + 143 = 421 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 200 + 407 = 607 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 281 + 599 = 880 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 686 + 677 = 1365 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 325 + 962 = 1287 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 17 × 64 = 1088 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 453 + 512 = 964 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 204 + 825 = 1036 right or wrong? (a) Wrong (b) Right

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