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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 123 · 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 94 =
  2. 2.Double 66 =
  3. 3.Double 25 =
  4. 4.Double 64 =
  5. 5.Double 18 =
  6. 6.Double 68 =
  7. 7.Double 67 =
  8. 8.Half of 130 =
  9. 9.Double 53 =
  10. 10.Double 71 =
  11. 11.Double 29 =
  12. 12.Half of 134 =
  13. 13.Half of 88 =
  14. 14.Double 89 =
  15. 15.Double 31 =
  16. 16.Double 33 =
  17. 17.Double 28 =
  18. 18.Half of 164 =
  19. 19.Half of 114 =
  20. 20.Double 43 =
  21. 21.Half of 66 =
  22. 22.Double 45 =
  23. 23.Half of 80 =
  24. 24.Half of 36 =
  25. 25.Half of 182 =
  26. 26.Double 38 =
  27. 27.Double 52 =
  28. 28.Half of 64 =
  29. 29.Double 47 =
  30. 30.Double 74 =
  31. 31.Half of 34 =
  32. 32.Double 51 =
  33. 33.Double 34 =
  34. 34.Double 23 =
  35. 35.Half of 128 =
  36. 36.Half of 126 =
  37. 37.Half of 32 =
  38. 38.Half of 50 =
  39. 39.Half of 158 =
  40. 40.Double 88 =

Answer key

  1. 188
  2. 132
  3. 50
  4. 128
  5. 36
  6. 136
  7. 134
  8. 65
  9. 106
  10. 142
  11. 58
  12. 67
  13. 44
  14. 178
  15. 62
  16. 66
  17. 56
  18. 82
  19. 57
  20. 86
  21. 33
  22. 90
  23. 40
  24. 18
  25. 91
  26. 76
  27. 104
  28. 32
  29. 94
  30. 148
  31. 17
  32. 102
  33. 68
  34. 46
  35. 64
  36. 63
  37. 16
  38. 25
  39. 79
  40. 176

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