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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 886 · 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 43 =
  2. 2.Double 26 =
  3. 3.Double 46 =
  4. 4.Half of 150 =
  5. 5.Double 93 =
  6. 6.Double 33 =
  7. 7.Half of 62 =
  8. 8.Half of 182 =
  9. 9.Half of 198 =
  10. 10.Half of 130 =
  11. 11.Half of 146 =
  12. 12.Double 41 =
  13. 13.Double 42 =
  14. 14.Double 58 =
  15. 15.Double 16 =
  16. 16.Double 32 =
  17. 17.Double 99 =
  18. 18.Half of 98 =
  19. 19.Half of 40 =
  20. 20.Half of 70 =
  21. 21.Half of 120 =
  22. 22.Half of 118 =
  23. 23.Half of 194 =
  24. 24.Double 73 =
  25. 25.Double 81 =
  26. 26.Double 55 =
  27. 27.Double 74 =
  28. 28.Half of 106 =
  29. 29.Double 89 =
  30. 30.Half of 52 =
  31. 31.Double 62 =
  32. 32.Half of 112 =
  33. 33.Double 98 =
  34. 34.Double 18 =
  35. 35.Half of 102 =
  36. 36.Double 54 =
  37. 37.Double 53 =
  38. 38.Half of 46 =
  39. 39.Double 38 =
  40. 40.Half of 114 =

Answer key

  1. 86
  2. 52
  3. 92
  4. 75
  5. 186
  6. 66
  7. 31
  8. 91
  9. 99
  10. 65
  11. 73
  12. 82
  13. 84
  14. 116
  15. 32
  16. 64
  17. 198
  18. 49
  19. 20
  20. 35
  21. 60
  22. 59
  23. 97
  24. 146
  25. 162
  26. 110
  27. 148
  28. 53
  29. 178
  30. 26
  31. 124
  32. 56
  33. 196
  34. 36
  35. 51
  36. 108
  37. 106
  38. 23
  39. 76
  40. 57

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