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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 482 · 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 146 =
  2. 2.Half of 126 =
  3. 3.Double 24 =
  4. 4.Half of 56 =
  5. 5.Double 79 =
  6. 6.Half of 192 =
  7. 7.Double 47 =
  8. 8.Double 91 =
  9. 9.Double 18 =
  10. 10.Half of 32 =
  11. 11.Double 44 =
  12. 12.Half of 148 =
  13. 13.Half of 54 =
  14. 14.Double 51 =
  15. 15.Double 66 =
  16. 16.Half of 158 =
  17. 17.Half of 134 =
  18. 18.Double 62 =
  19. 19.Double 25 =
  20. 20.Double 45 =
  21. 21.Half of 112 =
  22. 22.Double 34 =
  23. 23.Double 59 =
  24. 24.Double 27 =
  25. 25.Double 28 =
  26. 26.Half of 122 =
  27. 27.Half of 140 =
  28. 28.Half of 62 =
  29. 29.Half of 182 =
  30. 30.Double 77 =
  31. 31.Double 31 =
  32. 32.Half of 100 =
  33. 33.Half of 130 =
  34. 34.Double 72 =
  35. 35.Double 67 =
  36. 36.Double 94 =
  37. 37.Half of 184 =
  38. 38.Double 83 =
  39. 39.Double 58 =
  40. 40.Double 61 =

Answer key

  1. 73
  2. 63
  3. 48
  4. 28
  5. 158
  6. 96
  7. 94
  8. 182
  9. 36
  10. 16
  11. 88
  12. 74
  13. 27
  14. 102
  15. 132
  16. 79
  17. 67
  18. 124
  19. 50
  20. 90
  21. 56
  22. 68
  23. 118
  24. 54
  25. 56
  26. 61
  27. 70
  28. 31
  29. 91
  30. 154
  31. 62
  32. 50
  33. 65
  34. 144
  35. 134
  36. 188
  37. 92
  38. 166
  39. 116
  40. 122

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