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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 393 · 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 130 =
  2. 2.Half of 164 =
  3. 3.Double 58 =
  4. 4.Double 29 =
  5. 5.Double 27 =
  6. 6.Double 97 =
  7. 7.Double 16 =
  8. 8.Double 96 =
  9. 9.Half of 192 =
  10. 10.Half of 84 =
  11. 11.Double 98 =
  12. 12.Double 67 =
  13. 13.Half of 40 =
  14. 14.Double 89 =
  15. 15.Half of 150 =
  16. 16.Double 45 =
  17. 17.Double 77 =
  18. 18.Double 66 =
  19. 19.Double 41 =
  20. 20.Double 74 =
  21. 21.Half of 186 =
  22. 22.Double 51 =
  23. 23.Half of 32 =
  24. 24.Half of 122 =
  25. 25.Double 48 =
  26. 26.Double 39 =
  27. 27.Double 78 =
  28. 28.Double 68 =
  29. 29.Half of 64 =
  30. 30.Double 72 =
  31. 31.Double 31 =
  32. 32.Double 18 =
  33. 33.Double 21 =
  34. 34.Half of 70 =
  35. 35.Half of 100 =
  36. 36.Double 76 =
  37. 37.Double 32 =
  38. 38.Half of 98 =
  39. 39.Half of 30 =
  40. 40.Double 94 =

Answer key

  1. 65
  2. 82
  3. 116
  4. 58
  5. 54
  6. 194
  7. 32
  8. 192
  9. 96
  10. 42
  11. 196
  12. 134
  13. 20
  14. 178
  15. 75
  16. 90
  17. 154
  18. 132
  19. 82
  20. 148
  21. 93
  22. 102
  23. 16
  24. 61
  25. 96
  26. 78
  27. 156
  28. 136
  29. 32
  30. 144
  31. 62
  32. 36
  33. 42
  34. 35
  35. 50
  36. 152
  37. 64
  38. 49
  39. 15
  40. 188

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