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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 715 · 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 77 =
  2. 2.Double 21 =
  3. 3.Double 34 =
  4. 4.Double 82 =
  5. 5.Double 44 =
  6. 6.Half of 50 =
  7. 7.Half of 108 =
  8. 8.Half of 188 =
  9. 9.Double 71 =
  10. 10.Half of 64 =
  11. 11.Double 51 =
  12. 12.Half of 114 =
  13. 13.Double 85 =
  14. 14.Double 92 =
  15. 15.Half of 102 =
  16. 16.Half of 138 =
  17. 17.Double 19 =
  18. 18.Half of 68 =
  19. 19.Double 26 =
  20. 20.Half of 196 =
  21. 21.Double 95 =
  22. 22.Double 38 =
  23. 23.Double 63 =
  24. 24.Half of 36 =
  25. 25.Double 91 =
  26. 26.Half of 148 =
  27. 27.Double 43 =
  28. 28.Double 22 =
  29. 29.Half of 134 =
  30. 30.Half of 58 =
  31. 31.Half of 38 =
  32. 32.Double 75 =
  33. 33.Double 73 =
  34. 34.Double 53 =
  35. 35.Half of 60 =
  36. 36.Half of 42 =
  37. 37.Half of 86 =
  38. 38.Double 18 =
  39. 39.Half of 34 =
  40. 40.Half of 192 =

Answer key

  1. 154
  2. 42
  3. 68
  4. 164
  5. 88
  6. 25
  7. 54
  8. 94
  9. 142
  10. 32
  11. 102
  12. 57
  13. 170
  14. 184
  15. 51
  16. 69
  17. 38
  18. 34
  19. 52
  20. 98
  21. 190
  22. 76
  23. 126
  24. 18
  25. 182
  26. 74
  27. 86
  28. 44
  29. 67
  30. 29
  31. 19
  32. 150
  33. 146
  34. 106
  35. 30
  36. 21
  37. 43
  38. 36
  39. 17
  40. 96

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