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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 901 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 39 =
  2. 2.Double 73 =
  3. 3.Double 72 =
  4. 4.Half of 106 =
  5. 5.Half of 190 =
  6. 6.Double 76 =
  7. 7.Double 41 =
  8. 8.Half of 126 =
  9. 9.Half of 82 =
  10. 10.Double 37 =
  11. 11.Half of 34 =
  12. 12.Half of 44 =
  13. 13.Double 98 =
  14. 14.Double 21 =
  15. 15.Double 36 =
  16. 16.Half of 114 =
  17. 17.Double 92 =
  18. 18.Double 44 =
  19. 19.Double 82 =
  20. 20.Double 63 =
  21. 21.Double 48 =
  22. 22.Double 89 =
  23. 23.Half of 156 =
  24. 24.Half of 134 =
  25. 25.Double 61 =
  26. 26.Half of 146 =
  27. 27.Half of 26 =
  28. 28.Half of 72 =
  29. 29.Double 95 =
  30. 30.Half of 40 =
  31. 31.Half of 38 =
  32. 32.Double 69 =
  33. 33.Double 18 =
  34. 34.Half of 116 =
  35. 35.Double 17 =
  36. 36.Half of 130 =
  37. 37.Half of 46 =
  38. 38.Half of 160 =
  39. 39.Double 31 =
  40. 40.Double 22 =

Answer key

  1. 78
  2. 146
  3. 144
  4. 53
  5. 95
  6. 152
  7. 82
  8. 63
  9. 41
  10. 74
  11. 17
  12. 22
  13. 196
  14. 42
  15. 72
  16. 57
  17. 184
  18. 88
  19. 164
  20. 126
  21. 96
  22. 178
  23. 78
  24. 67
  25. 122
  26. 73
  27. 13
  28. 36
  29. 190
  30. 20
  31. 19
  32. 138
  33. 36
  34. 58
  35. 34
  36. 65
  37. 23
  38. 80
  39. 62
  40. 44

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