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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 738 · 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 84 =
  2. 2.Half of 114 =
  3. 3.Double 41 =
  4. 4.Double 78 =
  5. 5.Double 51 =
  6. 6.Double 58 =
  7. 7.Half of 52 =
  8. 8.Half of 196 =
  9. 9.Double 23 =
  10. 10.Double 44 =
  11. 11.Double 27 =
  12. 12.Half of 44 =
  13. 13.Double 87 =
  14. 14.Double 49 =
  15. 15.Double 74 =
  16. 16.Half of 140 =
  17. 17.Half of 46 =
  18. 18.Double 17 =
  19. 19.Half of 150 =
  20. 20.Half of 60 =
  21. 21.Double 31 =
  22. 22.Half of 194 =
  23. 23.Double 75 =
  24. 24.Double 54 =
  25. 25.Half of 86 =
  26. 26.Half of 174 =
  27. 27.Double 35 =
  28. 28.Half of 166 =
  29. 29.Double 81 =
  30. 30.Double 98 =
  31. 31.Half of 48 =
  32. 32.Double 46 =
  33. 33.Double 88 =
  34. 34.Double 32 =
  35. 35.Half of 164 =
  36. 36.Half of 126 =
  37. 37.Double 37 =
  38. 38.Double 76 =
  39. 39.Double 67 =
  40. 40.Double 59 =

Answer key

  1. 42
  2. 57
  3. 82
  4. 156
  5. 102
  6. 116
  7. 26
  8. 98
  9. 46
  10. 88
  11. 54
  12. 22
  13. 174
  14. 98
  15. 148
  16. 70
  17. 23
  18. 34
  19. 75
  20. 30
  21. 62
  22. 97
  23. 150
  24. 108
  25. 43
  26. 87
  27. 70
  28. 83
  29. 162
  30. 196
  31. 24
  32. 92
  33. 176
  34. 64
  35. 82
  36. 63
  37. 74
  38. 152
  39. 134
  40. 118

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