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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 193 · 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 25 =
  2. 2.Half of 102 =
  3. 3.Double 36 =
  4. 4.Double 55 =
  5. 5.Double 94 =
  6. 6.Double 27 =
  7. 7.Double 34 =
  8. 8.Double 16 =
  9. 9.Double 35 =
  10. 10.Half of 44 =
  11. 11.Half of 70 =
  12. 12.Half of 40 =
  13. 13.Double 44 =
  14. 14.Half of 100 =
  15. 15.Half of 192 =
  16. 16.Double 97 =
  17. 17.Double 58 =
  18. 18.Double 83 =
  19. 19.Double 48 =
  20. 20.Half of 142 =
  21. 21.Double 61 =
  22. 22.Half of 60 =
  23. 23.Half of 174 =
  24. 24.Half of 162 =
  25. 25.Half of 186 =
  26. 26.Half of 184 =
  27. 27.Double 98 =
  28. 28.Half of 112 =
  29. 29.Half of 134 =
  30. 30.Double 69 =
  31. 31.Double 74 =
  32. 32.Half of 132 =
  33. 33.Double 33 =
  34. 34.Half of 114 =
  35. 35.Double 54 =
  36. 36.Double 56 =
  37. 37.Half of 170 =
  38. 38.Half of 42 =
  39. 39.Double 21 =
  40. 40.Half of 52 =

Answer key

  1. 50
  2. 51
  3. 72
  4. 110
  5. 188
  6. 54
  7. 68
  8. 32
  9. 70
  10. 22
  11. 35
  12. 20
  13. 88
  14. 50
  15. 96
  16. 194
  17. 116
  18. 166
  19. 96
  20. 71
  21. 122
  22. 30
  23. 87
  24. 81
  25. 93
  26. 92
  27. 196
  28. 56
  29. 67
  30. 138
  31. 148
  32. 66
  33. 66
  34. 57
  35. 108
  36. 112
  37. 85
  38. 21
  39. 42
  40. 26

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