Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 339 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 881 + 199 = 1081. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 633 + 285 = 918. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 49 × 23 = 1127. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 97 × 31 = 3007. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 58 × 84 = 4870. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 253 + 411 = 662. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 341 + 273 = 606. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 13 × 46 = 599. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 658 + 213 = 871. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 276 + 255 = 531. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 73 = 1537. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 670 + 934 = 1604. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 231 + 816 = 1047. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 20 × 96 = 1917. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 47 = 2444. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 67 × 73 = 4891. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 70 × 58 = 4060. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 766 + 337 = 1109. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 439 + 536 = 975. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 647 + 715 = 1362. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 664 + 434 = 1094. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 514 + 250 = 764. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 987 + 987 = 1979. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 47 × 56 = 2632. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 20 = 400. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 22 × 80 = 1760. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 78 × 52 = 4054. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 617 + 558 = 1175. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 394 + 793 = 1179. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 51 × 35 = 1793. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 43 × 14 = 608. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 266 + 584 = 851. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 493 + 954 = 1447. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 907 + 633 = 1545. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 169 + 449 = 618. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 35 × 69 = 2409. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 465 + 758 = 1227. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 77 × 67 = 5159. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 32 × 30 = 958. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 76 × 98 = 7444. Correct or wrong? (a) correct (b) wrong

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