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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 772 · 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 100 =
  2. 2.Double 78 =
  3. 3.Half of 92 =
  4. 4.Double 21 =
  5. 5.Double 51 =
  6. 6.Double 24 =
  7. 7.Double 53 =
  8. 8.Half of 74 =
  9. 9.Half of 130 =
  10. 10.Double 96 =
  11. 11.Half of 96 =
  12. 12.Double 44 =
  13. 13.Double 31 =
  14. 14.Double 42 =
  15. 15.Half of 174 =
  16. 16.Half of 64 =
  17. 17.Half of 198 =
  18. 18.Half of 116 =
  19. 19.Half of 158 =
  20. 20.Double 22 =
  21. 21.Double 84 =
  22. 22.Double 97 =
  23. 23.Half of 40 =
  24. 24.Double 79 =
  25. 25.Half of 32 =
  26. 26.Double 28 =
  27. 27.Half of 176 =
  28. 28.Half of 126 =
  29. 29.Double 69 =
  30. 30.Double 85 =
  31. 31.Half of 50 =
  32. 32.Double 61 =
  33. 33.Double 64 =
  34. 34.Half of 98 =
  35. 35.Double 75 =
  36. 36.Double 38 =
  37. 37.Half of 36 =
  38. 38.Double 98 =
  39. 39.Half of 42 =
  40. 40.Double 71 =

Answer key

  1. 50
  2. 156
  3. 46
  4. 42
  5. 102
  6. 48
  7. 106
  8. 37
  9. 65
  10. 192
  11. 48
  12. 88
  13. 62
  14. 84
  15. 87
  16. 32
  17. 99
  18. 58
  19. 79
  20. 44
  21. 168
  22. 194
  23. 20
  24. 158
  25. 16
  26. 56
  27. 88
  28. 63
  29. 138
  30. 170
  31. 25
  32. 122
  33. 128
  34. 49
  35. 150
  36. 76
  37. 18
  38. 196
  39. 21
  40. 142

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