Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 788 · 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 20 × 24 = 482 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 69 = 1932 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 346 + 484 = 830 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 82 × 79 = 6479 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 40 × 54 = 2155 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 860 + 106 = 966 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 280 + 248 = 537 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 550 + 651 = 1201 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 619 + 783 = 1405 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 214 + 933 = 1143 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 43 × 12 = 516 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 54 × 76 = 4104 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 74 × 26 = 1922 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 443 + 889 = 1332 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 92 × 27 = 2484 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 24 × 37 = 884 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 694 + 633 = 1327 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 22 × 54 = 1187 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 38 × 19 = 720 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 194 + 173 = 367 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 985 + 319 = 1304 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 47 × 27 = 1269 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 28 × 88 = 2470 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 80 × 98 = 7836 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 59 = 4244 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 73 = 6498 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 26 × 99 = 2574 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 55 × 50 = 2750 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 76 × 94 = 7146 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 136 + 669 = 801 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 77 = 1617 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 49 × 17 = 838 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 34 × 12 = 408 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 84 × 42 = 3528 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 563 + 587 = 1147 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 538 + 431 = 969 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 82 × 67 = 5494 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 378 + 970 = 1344 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 77 × 13 = 1001 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 145 + 710 = 855 right or wrong? (a) Right (b) Wrong

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