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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 85 · 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 77 =
  2. 2.Half of 34 =
  3. 3.Half of 48 =
  4. 4.Double 81 =
  5. 5.Half of 168 =
  6. 6.Half of 132 =
  7. 7.Double 98 =
  8. 8.Double 21 =
  9. 9.Double 94 =
  10. 10.Double 74 =
  11. 11.Double 33 =
  12. 12.Double 82 =
  13. 13.Half of 96 =
  14. 14.Double 72 =
  15. 15.Double 35 =
  16. 16.Half of 128 =
  17. 17.Double 45 =
  18. 18.Double 66 =
  19. 19.Half of 64 =
  20. 20.Half of 92 =
  21. 21.Double 31 =
  22. 22.Half of 82 =
  23. 23.Double 27 =
  24. 24.Half of 28 =
  25. 25.Half of 162 =
  26. 26.Double 32 =
  27. 27.Half of 46 =
  28. 28.Double 75 =
  29. 29.Double 51 =
  30. 30.Half of 198 =
  31. 31.Double 19 =
  32. 32.Double 41 =
  33. 33.Half of 190 =
  34. 34.Half of 148 =
  35. 35.Double 95 =
  36. 36.Double 46 =
  37. 37.Double 44 =
  38. 38.Double 69 =
  39. 39.Half of 106 =
  40. 40.Double 88 =

Answer key

  1. 154
  2. 17
  3. 24
  4. 162
  5. 84
  6. 66
  7. 196
  8. 42
  9. 188
  10. 148
  11. 66
  12. 164
  13. 48
  14. 144
  15. 70
  16. 64
  17. 90
  18. 132
  19. 32
  20. 46
  21. 62
  22. 41
  23. 54
  24. 14
  25. 81
  26. 64
  27. 23
  28. 150
  29. 102
  30. 99
  31. 38
  32. 82
  33. 95
  34. 74
  35. 190
  36. 92
  37. 88
  38. 138
  39. 53
  40. 176

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