Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 12 · 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 346 + 845 = 1191 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 41 × 46 = 1892 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 392 + 964 = 1356 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 51 = 1632 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 42 × 86 = 3612 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 15 × 29 = 443 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 206 + 408 = 614 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 410 + 346 = 764 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 770 + 354 = 1124 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 65 × 19 = 1235 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 66 × 46 = 3036 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 34 × 57 = 1938 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 562 + 122 = 692 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 89 × 39 = 3474 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 43 × 46 = 1978 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 411 + 318 = 729 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 419 + 882 = 1292 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 958 + 907 = 1865 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 43 × 72 = 3094 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 900 + 625 = 1525 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 68 × 21 = 1435 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 47 × 90 = 4230 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 150 + 584 = 734 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 19 × 39 = 734 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 51 × 15 = 760 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 228 + 765 = 993 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 84 × 35 = 2940 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 22 × 57 = 1263 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 265 + 509 = 767 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 91 × 32 = 2912 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 56 × 90 = 5040 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 37 × 98 = 3634 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 682 + 945 = 1623 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 279 + 331 = 610 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 200 + 303 = 496 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 66 × 97 = 6402 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 60 × 36 = 2165 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 117 + 364 = 479 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 95 × 99 = 9407 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 734 + 210 = 944 right or wrong? (a) Right (b) Wrong

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