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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 387 · 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 106 =
  2. 2.Double 22 =
  3. 3.Double 88 =
  4. 4.Half of 124 =
  5. 5.Double 25 =
  6. 6.Half of 118 =
  7. 7.Double 51 =
  8. 8.Half of 96 =
  9. 9.Half of 32 =
  10. 10.Double 41 =
  11. 11.Half of 162 =
  12. 12.Half of 50 =
  13. 13.Half of 150 =
  14. 14.Half of 160 =
  15. 15.Double 95 =
  16. 16.Double 75 =
  17. 17.Double 74 =
  18. 18.Double 19 =
  19. 19.Double 33 =
  20. 20.Half of 170 =
  21. 21.Half of 176 =
  22. 22.Half of 88 =
  23. 23.Half of 56 =
  24. 24.Double 72 =
  25. 25.Half of 184 =
  26. 26.Half of 52 =
  27. 27.Double 71 =
  28. 28.Double 96 =
  29. 29.Double 49 =
  30. 30.Half of 146 =
  31. 31.Half of 166 =
  32. 32.Half of 114 =
  33. 33.Double 68 =
  34. 34.Double 59 =
  35. 35.Half of 44 =
  36. 36.Half of 152 =
  37. 37.Half of 112 =
  38. 38.Half of 156 =
  39. 39.Double 62 =
  40. 40.Half of 120 =

Answer key

  1. 53
  2. 44
  3. 176
  4. 62
  5. 50
  6. 59
  7. 102
  8. 48
  9. 16
  10. 82
  11. 81
  12. 25
  13. 75
  14. 80
  15. 190
  16. 150
  17. 148
  18. 38
  19. 66
  20. 85
  21. 88
  22. 44
  23. 28
  24. 144
  25. 92
  26. 26
  27. 142
  28. 192
  29. 98
  30. 73
  31. 83
  32. 57
  33. 136
  34. 118
  35. 22
  36. 76
  37. 56
  38. 78
  39. 124
  40. 60

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