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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 622 · 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 196 =
  2. 2.Half of 42 =
  3. 3.Double 21 =
  4. 4.Half of 152 =
  5. 5.Half of 30 =
  6. 6.Double 25 =
  7. 7.Half of 168 =
  8. 8.Half of 108 =
  9. 9.Half of 94 =
  10. 10.Double 91 =
  11. 11.Double 57 =
  12. 12.Double 47 =
  13. 13.Half of 146 =
  14. 14.Half of 54 =
  15. 15.Half of 118 =
  16. 16.Half of 184 =
  17. 17.Double 48 =
  18. 18.Double 87 =
  19. 19.Double 38 =
  20. 20.Half of 132 =
  21. 21.Double 17 =
  22. 22.Double 27 =
  23. 23.Half of 56 =
  24. 24.Half of 160 =
  25. 25.Double 98 =
  26. 26.Half of 180 =
  27. 27.Half of 60 =
  28. 28.Half of 86 =
  29. 29.Double 66 =
  30. 30.Double 51 =
  31. 31.Half of 154 =
  32. 32.Double 81 =
  33. 33.Double 96 =
  34. 34.Double 63 =
  35. 35.Double 86 =
  36. 36.Half of 136 =
  37. 37.Double 61 =
  38. 38.Half of 162 =
  39. 39.Double 59 =
  40. 40.Double 85 =

Answer key

  1. 98
  2. 21
  3. 42
  4. 76
  5. 15
  6. 50
  7. 84
  8. 54
  9. 47
  10. 182
  11. 114
  12. 94
  13. 73
  14. 27
  15. 59
  16. 92
  17. 96
  18. 174
  19. 76
  20. 66
  21. 34
  22. 54
  23. 28
  24. 80
  25. 196
  26. 90
  27. 30
  28. 43
  29. 132
  30. 102
  31. 77
  32. 162
  33. 192
  34. 126
  35. 172
  36. 68
  37. 122
  38. 81
  39. 118
  40. 170

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