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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 690 · 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 53 =
  2. 2.Double 93 =
  3. 3.Double 61 =
  4. 4.Double 54 =
  5. 5.Double 92 =
  6. 6.Half of 62 =
  7. 7.Double 24 =
  8. 8.Half of 194 =
  9. 9.Half of 180 =
  10. 10.Half of 70 =
  11. 11.Double 91 =
  12. 12.Half of 100 =
  13. 13.Double 66 =
  14. 14.Half of 152 =
  15. 15.Double 41 =
  16. 16.Double 51 =
  17. 17.Double 63 =
  18. 18.Half of 150 =
  19. 19.Double 94 =
  20. 20.Half of 166 =
  21. 21.Double 38 =
  22. 22.Double 85 =
  23. 23.Double 74 =
  24. 24.Double 96 =
  25. 25.Double 17 =
  26. 26.Half of 190 =
  27. 27.Double 52 =
  28. 28.Half of 168 =
  29. 29.Double 75 =
  30. 30.Half of 174 =
  31. 31.Half of 196 =
  32. 32.Half of 48 =
  33. 33.Half of 68 =
  34. 34.Half of 118 =
  35. 35.Double 83 =
  36. 36.Half of 138 =
  37. 37.Half of 82 =
  38. 38.Double 58 =
  39. 39.Double 34 =
  40. 40.Half of 64 =

Answer key

  1. 106
  2. 186
  3. 122
  4. 108
  5. 184
  6. 31
  7. 48
  8. 97
  9. 90
  10. 35
  11. 182
  12. 50
  13. 132
  14. 76
  15. 82
  16. 102
  17. 126
  18. 75
  19. 188
  20. 83
  21. 76
  22. 170
  23. 148
  24. 192
  25. 34
  26. 95
  27. 104
  28. 84
  29. 150
  30. 87
  31. 98
  32. 24
  33. 34
  34. 59
  35. 166
  36. 69
  37. 41
  38. 116
  39. 68
  40. 32

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