Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 352 · 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 48 × 56 = 2688 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 12 = 192 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 166 + 178 = 348 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 16 × 63 = 1000 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 260 + 908 = 1168 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 97 = 1556 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 46 × 26 = 1189 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 16 × 36 = 576 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 69 × 50 = 3450 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 902 + 208 = 1112 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 185 + 520 = 703 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 94 × 32 = 3010 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 982 + 740 = 1713 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 806 + 670 = 1476 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 75 × 64 = 4800 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 34 × 45 = 1530 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 74 × 49 = 3626 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 22 × 14 = 308 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 260 + 316 = 575 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 211 + 554 = 757 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 918 + 703 = 1628 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 320 + 299 = 619 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 881 + 151 = 1032 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 950 + 785 = 1735 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 411 + 829 = 1240 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 938 + 290 = 1228 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 538 + 926 = 1464 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 84 × 59 = 4960 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 70 = 2800 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 34 = 816 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 86 × 32 = 2752 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 456 + 341 = 797 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 40 × 54 = 2162 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 41 × 95 = 3890 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 548 + 324 = 865 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 75 × 53 = 3968 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 330 + 798 = 1128 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 80 × 65 = 5200 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 904 + 553 = 1457 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 32 × 14 = 448 right or wrong? (a) Wrong (b) Right

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