Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 137 · 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 179 + 986 = 1165 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 49 × 16 = 790 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 535 + 754 = 1289 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 659 + 583 = 1246 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 54 × 51 = 2762 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 483 + 769 = 1257 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 844 + 585 = 1434 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 903 + 169 = 1079 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 604 + 500 = 1109 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 16 × 52 = 832 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 95 × 28 = 2664 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 79 × 62 = 4898 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 951 + 522 = 1473 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 188 + 313 = 501 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 91 × 59 = 5369 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 67 × 18 = 1206 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 196 + 515 = 711 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 440 + 934 = 1370 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 97 × 18 = 1749 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 76 = 5776 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 92 × 17 = 1555 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 71 × 58 = 4118 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 890 + 127 = 1025 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 46 × 65 = 2988 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 19 × 79 = 1497 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 57 × 32 = 1824 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 757 + 598 = 1362 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 14 × 63 = 882 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 276 + 873 = 1149 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 896 + 470 = 1374 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 762 + 640 = 1404 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 61 × 95 = 5795 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 27 × 72 = 1944 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 53 × 67 = 3551 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 77 = 4614 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 91 × 16 = 1456 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 58 × 35 = 2030 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 65 × 44 = 2860 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 55 × 48 = 2640 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 771 + 617 = 1388 right or wrong? (a) Wrong (b) Right

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