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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 749 · 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 98 =
  2. 2.Double 97 =
  3. 3.Half of 46 =
  4. 4.Double 73 =
  5. 5.Double 91 =
  6. 6.Half of 104 =
  7. 7.Half of 106 =
  8. 8.Half of 90 =
  9. 9.Half of 196 =
  10. 10.Double 57 =
  11. 11.Double 61 =
  12. 12.Half of 72 =
  13. 13.Double 42 =
  14. 14.Half of 140 =
  15. 15.Double 74 =
  16. 16.Half of 110 =
  17. 17.Double 18 =
  18. 18.Double 81 =
  19. 19.Half of 138 =
  20. 20.Half of 44 =
  21. 21.Half of 30 =
  22. 22.Half of 128 =
  23. 23.Double 65 =
  24. 24.Half of 66 =
  25. 25.Double 45 =
  26. 26.Half of 40 =
  27. 27.Double 21 =
  28. 28.Double 26 =
  29. 29.Double 51 =
  30. 30.Double 66 =
  31. 31.Half of 38 =
  32. 32.Half of 136 =
  33. 33.Half of 116 =
  34. 34.Double 41 =
  35. 35.Double 35 =
  36. 36.Double 54 =
  37. 37.Double 88 =
  38. 38.Double 75 =
  39. 39.Half of 152 =
  40. 40.Double 95 =

Answer key

  1. 196
  2. 194
  3. 23
  4. 146
  5. 182
  6. 52
  7. 53
  8. 45
  9. 98
  10. 114
  11. 122
  12. 36
  13. 84
  14. 70
  15. 148
  16. 55
  17. 36
  18. 162
  19. 69
  20. 22
  21. 15
  22. 64
  23. 130
  24. 33
  25. 90
  26. 20
  27. 42
  28. 52
  29. 102
  30. 132
  31. 19
  32. 68
  33. 58
  34. 82
  35. 70
  36. 108
  37. 176
  38. 150
  39. 76
  40. 190

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