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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 991 · 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.Half of 138 =
  2. 2.Double 94 =
  3. 3.Double 41 =
  4. 4.Double 75 =
  5. 5.Double 34 =
  6. 6.Double 64 =
  7. 7.Half of 162 =
  8. 8.Double 47 =
  9. 9.Half of 28 =
  10. 10.Double 51 =
  11. 11.Half of 134 =
  12. 12.Double 85 =
  13. 13.Double 48 =
  14. 14.Double 89 =
  15. 15.Half of 76 =
  16. 16.Half of 130 =
  17. 17.Half of 44 =
  18. 18.Half of 178 =
  19. 19.Double 44 =
  20. 20.Half of 192 =
  21. 21.Double 42 =
  22. 22.Half of 36 =
  23. 23.Double 38 =
  24. 24.Half of 98 =
  25. 25.Double 72 =
  26. 26.Double 71 =
  27. 27.Double 58 =
  28. 28.Half of 58 =
  29. 29.Double 21 =
  30. 30.Double 82 =
  31. 31.Double 57 =
  32. 32.Double 33 =
  33. 33.Half of 26 =
  34. 34.Half of 154 =
  35. 35.Half of 196 =
  36. 36.Half of 152 =
  37. 37.Half of 38 =
  38. 38.Half of 90 =
  39. 39.Double 61 =
  40. 40.Double 56 =

Answer key

  1. 69
  2. 188
  3. 82
  4. 150
  5. 68
  6. 128
  7. 81
  8. 94
  9. 14
  10. 102
  11. 67
  12. 170
  13. 96
  14. 178
  15. 38
  16. 65
  17. 22
  18. 89
  19. 88
  20. 96
  21. 84
  22. 18
  23. 76
  24. 49
  25. 144
  26. 142
  27. 116
  28. 29
  29. 42
  30. 164
  31. 114
  32. 66
  33. 13
  34. 77
  35. 98
  36. 76
  37. 19
  38. 45
  39. 122
  40. 112

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