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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 180 · 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 18 =
  2. 2.Half of 156 =
  3. 3.Double 39 =
  4. 4.Half of 74 =
  5. 5.Half of 70 =
  6. 6.Half of 84 =
  7. 7.Double 51 =
  8. 8.Half of 106 =
  9. 9.Double 45 =
  10. 10.Half of 120 =
  11. 11.Half of 190 =
  12. 12.Half of 54 =
  13. 13.Half of 146 =
  14. 14.Double 67 =
  15. 15.Double 36 =
  16. 16.Half of 40 =
  17. 17.Half of 130 =
  18. 18.Double 87 =
  19. 19.Half of 144 =
  20. 20.Double 58 =
  21. 21.Double 37 =
  22. 22.Half of 58 =
  23. 23.Double 63 =
  24. 24.Half of 60 =
  25. 25.Double 66 =
  26. 26.Half of 56 =
  27. 27.Half of 128 =
  28. 28.Double 59 =
  29. 29.Double 55 =
  30. 30.Double 25 =
  31. 31.Double 46 =
  32. 32.Half of 42 =
  33. 33.Double 74 =
  34. 34.Double 22 =
  35. 35.Double 49 =
  36. 36.Double 41 =
  37. 37.Double 48 =
  38. 38.Double 16 =
  39. 39.Double 21 =
  40. 40.Double 72 =

Answer key

  1. 36
  2. 78
  3. 78
  4. 37
  5. 35
  6. 42
  7. 102
  8. 53
  9. 90
  10. 60
  11. 95
  12. 27
  13. 73
  14. 134
  15. 72
  16. 20
  17. 65
  18. 174
  19. 72
  20. 116
  21. 74
  22. 29
  23. 126
  24. 30
  25. 132
  26. 28
  27. 64
  28. 118
  29. 110
  30. 50
  31. 92
  32. 21
  33. 148
  34. 44
  35. 98
  36. 82
  37. 96
  38. 32
  39. 42
  40. 144

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