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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 834 · 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 43 =
  2. 2.Double 41 =
  3. 3.Half of 140 =
  4. 4.Half of 100 =
  5. 5.Half of 162 =
  6. 6.Double 94 =
  7. 7.Double 21 =
  8. 8.Half of 130 =
  9. 9.Double 38 =
  10. 10.Double 51 =
  11. 11.Double 91 =
  12. 12.Half of 102 =
  13. 13.Double 72 =
  14. 14.Double 68 =
  15. 15.Half of 186 =
  16. 16.Half of 150 =
  17. 17.Half of 106 =
  18. 18.Double 45 =
  19. 19.Double 49 =
  20. 20.Double 64 =
  21. 21.Half of 176 =
  22. 22.Half of 138 =
  23. 23.Double 74 =
  24. 24.Half of 64 =
  25. 25.Half of 92 =
  26. 26.Double 76 =
  27. 27.Double 86 =
  28. 28.Half of 182 =
  29. 29.Double 65 =
  30. 30.Double 33 =
  31. 31.Half of 166 =
  32. 32.Double 71 =
  33. 33.Half of 70 =
  34. 34.Double 84 =
  35. 35.Half of 26 =
  36. 36.Double 54 =
  37. 37.Half of 154 =
  38. 38.Double 37 =
  39. 39.Double 83 =
  40. 40.Double 34 =

Answer key

  1. 86
  2. 82
  3. 70
  4. 50
  5. 81
  6. 188
  7. 42
  8. 65
  9. 76
  10. 102
  11. 182
  12. 51
  13. 144
  14. 136
  15. 93
  16. 75
  17. 53
  18. 90
  19. 98
  20. 128
  21. 88
  22. 69
  23. 148
  24. 32
  25. 46
  26. 152
  27. 172
  28. 91
  29. 130
  30. 66
  31. 83
  32. 142
  33. 35
  34. 168
  35. 13
  36. 108
  37. 77
  38. 74
  39. 166
  40. 68

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