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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 62 · 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 44 =
  2. 2.Double 96 =
  3. 3.Double 46 =
  4. 4.Double 91 =
  5. 5.Double 36 =
  6. 6.Double 79 =
  7. 7.Half of 174 =
  8. 8.Double 85 =
  9. 9.Half of 128 =
  10. 10.Half of 124 =
  11. 11.Double 45 =
  12. 12.Half of 80 =
  13. 13.Half of 196 =
  14. 14.Half of 138 =
  15. 15.Double 61 =
  16. 16.Half of 96 =
  17. 17.Double 44 =
  18. 18.Half of 52 =
  19. 19.Half of 88 =
  20. 20.Half of 48 =
  21. 21.Half of 112 =
  22. 22.Half of 102 =
  23. 23.Half of 132 =
  24. 24.Half of 38 =
  25. 25.Double 86 =
  26. 26.Half of 74 =
  27. 27.Double 75 =
  28. 28.Double 31 =
  29. 29.Double 53 =
  30. 30.Double 78 =
  31. 31.Half of 108 =
  32. 32.Half of 122 =
  33. 33.Double 23 =
  34. 34.Double 17 =
  35. 35.Double 57 =
  36. 36.Double 34 =
  37. 37.Double 69 =
  38. 38.Half of 158 =
  39. 39.Double 49 =
  40. 40.Double 77 =

Answer key

  1. 22
  2. 192
  3. 92
  4. 182
  5. 72
  6. 158
  7. 87
  8. 170
  9. 64
  10. 62
  11. 90
  12. 40
  13. 98
  14. 69
  15. 122
  16. 48
  17. 88
  18. 26
  19. 44
  20. 24
  21. 56
  22. 51
  23. 66
  24. 19
  25. 172
  26. 37
  27. 150
  28. 62
  29. 106
  30. 156
  31. 54
  32. 61
  33. 46
  34. 34
  35. 114
  36. 68
  37. 138
  38. 79
  39. 98
  40. 154

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