Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 364 · 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 99 × 96 = 9504 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 20 × 12 = 237 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 22 × 90 = 1980 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 592 + 173 = 765 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 33 × 42 = 1386 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 48 × 96 = 4608 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 78 = 2103 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 235 + 599 = 834 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 985 + 947 = 1932 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 906 + 784 = 1696 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 27 × 85 = 2293 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 388 + 363 = 749 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 753 + 505 = 1258 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 109 + 850 = 959 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 12 = 576 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 39 × 89 = 3470 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 601 + 932 = 1539 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 563 + 676 = 1235 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 97 × 95 = 9215 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 84 = 6132 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 932 + 565 = 1491 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 847 + 476 = 1329 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 518 + 633 = 1150 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 204 + 321 = 528 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 745 + 316 = 1061 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 544 + 932 = 1476 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 513 + 468 = 981 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 28 × 12 = 336 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 36 × 37 = 1332 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 16 × 95 = 1520 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 20 × 88 = 1756 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 62 × 87 = 5394 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 785 + 716 = 1501 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 29 × 47 = 1363 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 14 × 94 = 1322 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 29 = 986 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 66 × 79 = 5214 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 881 + 857 = 1729 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 822 + 723 = 1545 right or wrong? (a) Right (b) Wrong

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