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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 512 · 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 16 =
  2. 2.Double 36 =
  3. 3.Double 37 =
  4. 4.Double 33 =
  5. 5.Half of 102 =
  6. 6.Double 66 =
  7. 7.Half of 26 =
  8. 8.Half of 58 =
  9. 9.Half of 120 =
  10. 10.Double 19 =
  11. 11.Double 21 =
  12. 12.Half of 192 =
  13. 13.Half of 142 =
  14. 14.Half of 190 =
  15. 15.Half of 32 =
  16. 16.Double 48 =
  17. 17.Double 25 =
  18. 18.Double 96 =
  19. 19.Half of 42 =
  20. 20.Double 95 =
  21. 21.Half of 78 =
  22. 22.Double 26 =
  23. 23.Half of 174 =
  24. 24.Half of 100 =
  25. 25.Half of 46 =
  26. 26.Half of 134 =
  27. 27.Half of 182 =
  28. 28.Double 18 =
  29. 29.Double 17 =
  30. 30.Double 76 =
  31. 31.Double 84 =
  32. 32.Half of 50 =
  33. 33.Double 61 =
  34. 34.Double 88 =
  35. 35.Half of 188 =
  36. 36.Double 38 =
  37. 37.Double 43 =
  38. 38.Double 59 =
  39. 39.Double 86 =
  40. 40.Half of 180 =

Answer key

  1. 32
  2. 72
  3. 74
  4. 66
  5. 51
  6. 132
  7. 13
  8. 29
  9. 60
  10. 38
  11. 42
  12. 96
  13. 71
  14. 95
  15. 16
  16. 96
  17. 50
  18. 192
  19. 21
  20. 190
  21. 39
  22. 52
  23. 87
  24. 50
  25. 23
  26. 67
  27. 91
  28. 36
  29. 34
  30. 152
  31. 168
  32. 25
  33. 122
  34. 176
  35. 94
  36. 76
  37. 86
  38. 118
  39. 172
  40. 90

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