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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 931 · 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 55 =
  2. 2.Double 29 =
  3. 3.Double 18 =
  4. 4.Double 58 =
  5. 5.Half of 106 =
  6. 6.Double 73 =
  7. 7.Double 66 =
  8. 8.Double 62 =
  9. 9.Double 37 =
  10. 10.Half of 50 =
  11. 11.Half of 88 =
  12. 12.Half of 184 =
  13. 13.Half of 56 =
  14. 14.Double 54 =
  15. 15.Double 41 =
  16. 16.Double 27 =
  17. 17.Half of 164 =
  18. 18.Double 28 =
  19. 19.Half of 124 =
  20. 20.Half of 58 =
  21. 21.Half of 118 =
  22. 22.Half of 150 =
  23. 23.Double 95 =
  24. 24.Half of 122 =
  25. 25.Double 63 =
  26. 26.Half of 74 =
  27. 27.Half of 120 =
  28. 28.Double 45 =
  29. 29.Half of 80 =
  30. 30.Double 26 =
  31. 31.Double 47 =
  32. 32.Double 94 =
  33. 33.Double 78 =
  34. 34.Half of 66 =
  35. 35.Double 51 =
  36. 36.Double 22 =
  37. 37.Half of 46 =
  38. 38.Double 16 =
  39. 39.Double 75 =
  40. 40.Double 71 =

Answer key

  1. 110
  2. 58
  3. 36
  4. 116
  5. 53
  6. 146
  7. 132
  8. 124
  9. 74
  10. 25
  11. 44
  12. 92
  13. 28
  14. 108
  15. 82
  16. 54
  17. 82
  18. 56
  19. 62
  20. 29
  21. 59
  22. 75
  23. 190
  24. 61
  25. 126
  26. 37
  27. 60
  28. 90
  29. 40
  30. 52
  31. 94
  32. 188
  33. 156
  34. 33
  35. 102
  36. 44
  37. 23
  38. 32
  39. 150
  40. 142

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