Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 185 · 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 933 + 683 = 1616 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 262 + 852 = 1119 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 327 + 318 = 638 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 94 × 30 = 2820 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 43 × 25 = 1072 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 84 × 98 = 8226 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 26 × 52 = 1352 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 163 + 447 = 610 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 228 + 887 = 1110 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 649 + 671 = 1320 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 78 × 70 = 5459 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 209 + 905 = 1114 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 56 × 65 = 3631 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 31 × 89 = 2758 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 390 + 711 = 1099 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 82 × 47 = 3859 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 71 = 2627 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 14 × 93 = 1302 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 13 × 62 = 806 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 312 + 228 = 533 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 57 × 86 = 4902 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 994 + 370 = 1355 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 62 × 81 = 5030 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 55 × 46 = 2530 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 28 × 17 = 480 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 65 = 6371 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 79 × 75 = 5924 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 793 + 943 = 1736 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 57 × 36 = 2052 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 455 + 181 = 636 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 14 × 22 = 308 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 39 = 1100 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 72 × 73 = 5255 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 599 + 650 = 1249 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 40 × 28 = 1120 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 84 × 76 = 6384 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 71 × 14 = 993 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 708 + 395 = 1103 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 83 × 14 = 1162 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 43 × 46 = 1974 right or wrong? (a) Right (b) Wrong

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