Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 845 · 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 391 + 830 = 1219 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 84 × 40 = 3360 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 41 × 34 = 1402 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 321 + 997 = 1312 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 58 × 45 = 2610 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 26 × 19 = 492 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 29 × 38 = 1102 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 859 + 481 = 1340 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 93 × 66 = 6142 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 85 × 33 = 2805 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 127 + 164 = 297 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 851 + 356 = 1205 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 18 = 1386 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 88 = 2378 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 372 + 739 = 1111 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 789 + 136 = 918 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 242 + 996 = 1238 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 949 + 207 = 1156 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 90 = 4320 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 41 × 92 = 3772 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 57 × 28 = 1604 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 704 + 111 = 815 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 699 + 829 = 1528 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 75 × 67 = 5027 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 427 + 863 = 1286 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 791 + 179 = 970 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 57 × 22 = 1261 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 642 + 412 = 1045 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 15 × 42 = 630 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 91 × 45 = 4095 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 23 = 1703 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 175 + 144 = 312 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 704 + 457 = 1161 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 50 × 72 = 3600 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 595 + 738 = 1333 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 455 + 707 = 1162 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 23 × 26 = 598 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 24 × 35 = 835 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 149 + 757 = 906 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 247 + 815 = 1062 right or wrong? (a) Wrong (b) Right

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