Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 867 · 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 145 + 798 = 943 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 795 + 409 = 1204 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 26 × 39 = 1020 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 157 + 753 = 913 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 908 + 454 = 1362 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 541 + 997 = 1538 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 75 × 96 = 7200 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 803 + 771 = 1574 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 83 × 64 = 5312 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 456 + 684 = 1140 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 194 + 318 = 514 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 22 × 80 = 1760 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 78 = 1413 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 90 × 40 = 3600 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 80 × 16 = 1276 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 89 × 99 = 8811 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 48 × 33 = 1577 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 44 × 84 = 3696 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 356 + 905 = 1258 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 35 × 18 = 631 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 205 + 527 = 728 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 37 × 15 = 555 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 86 × 72 = 6192 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 15 × 98 = 1470 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 900 + 701 = 1601 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 911 + 183 = 1094 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 26 × 91 = 2366 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 240 + 794 = 1034 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 174 + 285 = 456 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 41 = 1066 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 513 + 966 = 1478 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 73 × 56 = 4088 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 323 + 676 = 996 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 55 = 1430 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 28 × 37 = 1036 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 38 × 76 = 2886 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 92 × 84 = 7728 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 271 + 157 = 425 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 131 + 243 = 374 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 415 + 122 = 537 right or wrong? (a) Right (b) Wrong

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