Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 959 · 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 16 × 44 = 704 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 21 × 81 = 1701 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 47 × 41 = 1927 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 81 × 27 = 2193 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 366 + 740 = 1104 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 73 × 33 = 2417 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 524 + 884 = 1409 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 75 × 60 = 4508 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 74 × 78 = 5772 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 178 + 524 = 702 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 28 × 49 = 1369 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 60 × 43 = 2586 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 55 × 78 = 4290 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 730 + 195 = 925 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 50 × 29 = 1450 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 67 × 18 = 1206 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 355 + 918 = 1273 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 339 + 830 = 1169 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 941 + 859 = 1791 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 16 × 65 = 1040 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 421 + 129 = 550 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 15 × 53 = 795 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 28 × 42 = 1172 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 94 = 2070 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 55 × 59 = 3245 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 196 + 127 = 319 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 68 × 79 = 5372 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 67 × 47 = 3149 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 68 = 1430 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 85 = 4590 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 30 × 34 = 1017 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 80 × 64 = 5120 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 95 = 6183 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 671 + 913 = 1579 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 933 + 706 = 1648 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 313 + 159 = 463 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 96 × 34 = 3260 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 76 × 33 = 2508 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 97 × 71 = 6888 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 518 + 482 = 998 right or wrong? (a) Wrong (b) Right

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