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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 483 · 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 61 =
  2. 2.Double 88 =
  3. 3.Double 91 =
  4. 4.Half of 66 =
  5. 5.Half of 198 =
  6. 6.Half of 42 =
  7. 7.Double 34 =
  8. 8.Half of 104 =
  9. 9.Double 94 =
  10. 10.Double 42 =
  11. 11.Double 33 =
  12. 12.Double 49 =
  13. 13.Double 28 =
  14. 14.Double 47 =
  15. 15.Double 74 =
  16. 16.Half of 160 =
  17. 17.Double 27 =
  18. 18.Double 73 =
  19. 19.Half of 34 =
  20. 20.Double 85 =
  21. 21.Double 72 =
  22. 22.Half of 146 =
  23. 23.Half of 168 =
  24. 24.Double 24 =
  25. 25.Double 54 =
  26. 26.Double 51 =
  27. 27.Half of 102 =
  28. 28.Double 81 =
  29. 29.Half of 182 =
  30. 30.Half of 118 =
  31. 31.Half of 68 =
  32. 32.Half of 162 =
  33. 33.Double 59 =
  34. 34.Half of 192 =
  35. 35.Half of 28 =
  36. 36.Half of 62 =
  37. 37.Half of 170 =
  38. 38.Half of 48 =
  39. 39.Double 44 =
  40. 40.Double 35 =

Answer key

  1. 122
  2. 176
  3. 182
  4. 33
  5. 99
  6. 21
  7. 68
  8. 52
  9. 188
  10. 84
  11. 66
  12. 98
  13. 56
  14. 94
  15. 148
  16. 80
  17. 54
  18. 146
  19. 17
  20. 170
  21. 144
  22. 73
  23. 84
  24. 48
  25. 108
  26. 102
  27. 51
  28. 162
  29. 91
  30. 59
  31. 34
  32. 81
  33. 118
  34. 96
  35. 14
  36. 31
  37. 85
  38. 24
  39. 88
  40. 70

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