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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 346 · 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 70 =
  2. 2.Double 21 =
  3. 3.Double 24 =
  4. 4.Double 41 =
  5. 5.Half of 134 =
  6. 6.Double 17 =
  7. 7.Half of 184 =
  8. 8.Half of 52 =
  9. 9.Double 25 =
  10. 10.Double 54 =
  11. 11.Double 78 =
  12. 12.Half of 28 =
  13. 13.Half of 60 =
  14. 14.Half of 30 =
  15. 15.Double 55 =
  16. 16.Half of 136 =
  17. 17.Double 61 =
  18. 18.Double 19 =
  19. 19.Double 66 =
  20. 20.Half of 96 =
  21. 21.Half of 166 =
  22. 22.Half of 48 =
  23. 23.Half of 180 =
  24. 24.Double 53 =
  25. 25.Half of 168 =
  26. 26.Double 29 =
  27. 27.Double 33 =
  28. 28.Double 98 =
  29. 29.Half of 182 =
  30. 30.Half of 40 =
  31. 31.Double 79 =
  32. 32.Half of 196 =
  33. 33.Double 23 =
  34. 34.Double 37 =
  35. 35.Half of 98 =
  36. 36.Double 51 =
  37. 37.Double 72 =
  38. 38.Double 93 =
  39. 39.Half of 130 =
  40. 40.Half of 120 =

Answer key

  1. 35
  2. 42
  3. 48
  4. 82
  5. 67
  6. 34
  7. 92
  8. 26
  9. 50
  10. 108
  11. 156
  12. 14
  13. 30
  14. 15
  15. 110
  16. 68
  17. 122
  18. 38
  19. 132
  20. 48
  21. 83
  22. 24
  23. 90
  24. 106
  25. 84
  26. 58
  27. 66
  28. 196
  29. 91
  30. 20
  31. 158
  32. 98
  33. 46
  34. 74
  35. 49
  36. 102
  37. 144
  38. 186
  39. 65
  40. 60

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