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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 680 · 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 56 =
  2. 2.Half of 36 =
  3. 3.Double 83 =
  4. 4.Double 82 =
  5. 5.Half of 26 =
  6. 6.Double 51 =
  7. 7.Double 48 =
  8. 8.Half of 190 =
  9. 9.Double 34 =
  10. 10.Double 73 =
  11. 11.Double 88 =
  12. 12.Double 37 =
  13. 13.Half of 140 =
  14. 14.Double 18 =
  15. 15.Double 31 =
  16. 16.Half of 112 =
  17. 17.Half of 188 =
  18. 18.Half of 164 =
  19. 19.Half of 182 =
  20. 20.Double 17 =
  21. 21.Double 61 =
  22. 22.Double 33 =
  23. 23.Double 59 =
  24. 24.Half of 30 =
  25. 25.Half of 60 =
  26. 26.Half of 146 =
  27. 27.Half of 132 =
  28. 28.Double 63 =
  29. 29.Half of 28 =
  30. 30.Half of 56 =
  31. 31.Half of 38 =
  32. 32.Half of 130 =
  33. 33.Double 64 =
  34. 34.Double 29 =
  35. 35.Double 72 =
  36. 36.Half of 64 =
  37. 37.Half of 50 =
  38. 38.Half of 142 =
  39. 39.Double 91 =
  40. 40.Half of 128 =

Answer key

  1. 112
  2. 18
  3. 166
  4. 164
  5. 13
  6. 102
  7. 96
  8. 95
  9. 68
  10. 146
  11. 176
  12. 74
  13. 70
  14. 36
  15. 62
  16. 56
  17. 94
  18. 82
  19. 91
  20. 34
  21. 122
  22. 66
  23. 118
  24. 15
  25. 30
  26. 73
  27. 66
  28. 126
  29. 14
  30. 28
  31. 19
  32. 65
  33. 128
  34. 58
  35. 144
  36. 32
  37. 25
  38. 71
  39. 182
  40. 64

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