Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 178 · 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 970 + 150 = 1120 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 56 × 65 = 3640 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 93 × 85 = 7905 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 475 + 284 = 759 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 55 × 32 = 1760 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 177 + 114 = 296 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 24 × 55 = 1318 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 95 × 20 = 1898 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 780 + 113 = 893 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 77 × 30 = 2310 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 590 + 950 = 1538 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 231 + 871 = 1104 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 545 + 450 = 995 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 928 + 395 = 1331 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 280 + 606 = 886 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 394 + 214 = 611 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 693 + 889 = 1591 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 22 × 71 = 1567 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 56 = 1576 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 606 + 165 = 771 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 265 + 227 = 488 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 954 + 127 = 1083 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 485 + 241 = 720 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 305 + 842 = 1149 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 251 + 471 = 722 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 811 + 799 = 1619 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 52 × 46 = 2392 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 55 × 36 = 1980 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 40 × 92 = 3689 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 47 × 87 = 4082 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 70 × 53 = 3710 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 579 + 982 = 1554 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 168 + 483 = 651 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 784 + 859 = 1643 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 45 × 96 = 4320 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 33 × 48 = 1579 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 65 × 96 = 6236 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 469 + 784 = 1253 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 85 × 33 = 2799 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 504 + 413 = 910 right or wrong? (a) Right (b) Wrong

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