Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 369 · 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 53 × 52 = 2756 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 925 + 979 = 1904 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 493 + 357 = 845 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 523 + 988 = 1520 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 261 + 670 = 931 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 797 + 332 = 1131 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 119 + 361 = 489 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 64 × 76 = 4864 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 523 + 652 = 1175 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 39 = 507 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 583 + 295 = 878 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 998 + 431 = 1433 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 291 + 571 = 863 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 801 + 518 = 1319 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 419 + 215 = 634 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 152 + 195 = 352 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 139 + 202 = 341 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 395 + 296 = 691 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 931 + 164 = 1095 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 115 + 297 = 417 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 54 × 63 = 3399 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 31 = 527 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 47 × 93 = 4371 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 99 × 52 = 5150 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 99 × 78 = 7722 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 95 = 7229 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 500 + 452 = 952 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 804 + 228 = 1032 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 39 × 24 = 942 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 93 × 42 = 3906 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 24 × 42 = 1004 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 281 + 385 = 666 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 746 + 257 = 1003 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 550 + 990 = 1540 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 22 × 99 = 2180 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 83 × 42 = 3486 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 339 + 178 = 517 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 492 + 766 = 1258 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 15 × 57 = 855 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 85 × 91 = 7735 right or wrong? (a) Wrong (b) Right

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