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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 620 · 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 51 =
  2. 2.Half of 50 =
  3. 3.Double 21 =
  4. 4.Half of 38 =
  5. 5.Double 43 =
  6. 6.Half of 88 =
  7. 7.Double 97 =
  8. 8.Half of 130 =
  9. 9.Double 76 =
  10. 10.Double 32 =
  11. 11.Double 26 =
  12. 12.Half of 72 =
  13. 13.Double 64 =
  14. 14.Half of 122 =
  15. 15.Half of 154 =
  16. 16.Half of 164 =
  17. 17.Double 46 =
  18. 18.Double 38 =
  19. 19.Double 56 =
  20. 20.Double 33 =
  21. 21.Double 68 =
  22. 22.Half of 102 =
  23. 23.Half of 182 =
  24. 24.Half of 40 =
  25. 25.Half of 96 =
  26. 26.Double 77 =
  27. 27.Half of 146 =
  28. 28.Half of 134 =
  29. 29.Double 71 =
  30. 30.Half of 74 =
  31. 31.Half of 60 =
  32. 32.Double 55 =
  33. 33.Double 52 =
  34. 34.Half of 132 =
  35. 35.Half of 36 =
  36. 36.Half of 28 =
  37. 37.Half of 150 =
  38. 38.Half of 174 =
  39. 39.Half of 86 =
  40. 40.Double 61 =

Answer key

  1. 102
  2. 25
  3. 42
  4. 19
  5. 86
  6. 44
  7. 194
  8. 65
  9. 152
  10. 64
  11. 52
  12. 36
  13. 128
  14. 61
  15. 77
  16. 82
  17. 92
  18. 76
  19. 112
  20. 66
  21. 136
  22. 51
  23. 91
  24. 20
  25. 48
  26. 154
  27. 73
  28. 67
  29. 142
  30. 37
  31. 30
  32. 110
  33. 104
  34. 66
  35. 18
  36. 14
  37. 75
  38. 87
  39. 43
  40. 122

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