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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 615 · 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.Half of 98 =
  2. 2.Half of 90 =
  3. 3.Double 32 =
  4. 4.Half of 180 =
  5. 5.Half of 48 =
  6. 6.Half of 72 =
  7. 7.Double 39 =
  8. 8.Double 22 =
  9. 9.Double 72 =
  10. 10.Half of 32 =
  11. 11.Double 37 =
  12. 12.Double 44 =
  13. 13.Double 97 =
  14. 14.Double 53 =
  15. 15.Half of 78 =
  16. 16.Half of 198 =
  17. 17.Double 82 =
  18. 18.Double 66 =
  19. 19.Half of 126 =
  20. 20.Double 42 =
  21. 21.Double 81 =
  22. 22.Half of 118 =
  23. 23.Double 21 =
  24. 24.Double 52 =
  25. 25.Double 48 =
  26. 26.Half of 128 =
  27. 27.Double 54 =
  28. 28.Half of 148 =
  29. 29.Double 62 =
  30. 30.Double 51 =
  31. 31.Double 16 =
  32. 32.Half of 166 =
  33. 33.Double 74 =
  34. 34.Double 46 =
  35. 35.Half of 62 =
  36. 36.Double 56 =
  37. 37.Half of 138 =
  38. 38.Double 93 =
  39. 39.Double 99 =
  40. 40.Half of 66 =

Answer key

  1. 49
  2. 45
  3. 64
  4. 90
  5. 24
  6. 36
  7. 78
  8. 44
  9. 144
  10. 16
  11. 74
  12. 88
  13. 194
  14. 106
  15. 39
  16. 99
  17. 164
  18. 132
  19. 63
  20. 84
  21. 162
  22. 59
  23. 42
  24. 104
  25. 96
  26. 64
  27. 108
  28. 74
  29. 124
  30. 102
  31. 32
  32. 83
  33. 148
  34. 92
  35. 31
  36. 112
  37. 69
  38. 186
  39. 198
  40. 33

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