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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 212 · 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 64 =
  2. 2.Half of 74 =
  3. 3.Half of 46 =
  4. 4.Double 85 =
  5. 5.Double 32 =
  6. 6.Half of 28 =
  7. 7.Half of 108 =
  8. 8.Half of 38 =
  9. 9.Half of 194 =
  10. 10.Half of 54 =
  11. 11.Half of 138 =
  12. 12.Double 68 =
  13. 13.Double 82 =
  14. 14.Half of 170 =
  15. 15.Double 75 =
  16. 16.Double 73 =
  17. 17.Double 52 =
  18. 18.Half of 90 =
  19. 19.Double 34 =
  20. 20.Double 77 =
  21. 21.Double 55 =
  22. 22.Half of 70 =
  23. 23.Double 45 =
  24. 24.Double 24 =
  25. 25.Half of 136 =
  26. 26.Half of 130 =
  27. 27.Half of 142 =
  28. 28.Half of 48 =
  29. 29.Double 41 =
  30. 30.Double 91 =
  31. 31.Double 17 =
  32. 32.Double 58 =
  33. 33.Double 93 =
  34. 34.Half of 36 =
  35. 35.Double 35 =
  36. 36.Double 16 =
  37. 37.Half of 68 =
  38. 38.Half of 182 =
  39. 39.Half of 62 =
  40. 40.Double 89 =

Answer key

  1. 128
  2. 37
  3. 23
  4. 170
  5. 64
  6. 14
  7. 54
  8. 19
  9. 97
  10. 27
  11. 69
  12. 136
  13. 164
  14. 85
  15. 150
  16. 146
  17. 104
  18. 45
  19. 68
  20. 154
  21. 110
  22. 35
  23. 90
  24. 48
  25. 68
  26. 65
  27. 71
  28. 24
  29. 82
  30. 182
  31. 34
  32. 116
  33. 186
  34. 18
  35. 70
  36. 32
  37. 34
  38. 91
  39. 31
  40. 178

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