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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 652 · 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 73 =
  2. 2.Double 21 =
  3. 3.Double 66 =
  4. 4.Double 16 =
  5. 5.Double 38 =
  6. 6.Half of 144 =
  7. 7.Double 28 =
  8. 8.Half of 108 =
  9. 9.Half of 192 =
  10. 10.Half of 194 =
  11. 11.Double 91 =
  12. 12.Half of 138 =
  13. 13.Double 18 =
  14. 14.Half of 44 =
  15. 15.Half of 90 =
  16. 16.Half of 82 =
  17. 17.Double 93 =
  18. 18.Double 41 =
  19. 19.Double 32 =
  20. 20.Double 36 =
  21. 21.Double 56 =
  22. 22.Double 96 =
  23. 23.Double 68 =
  24. 24.Double 63 =
  25. 25.Half of 46 =
  26. 26.Half of 30 =
  27. 27.Double 22 =
  28. 28.Double 89 =
  29. 29.Half of 114 =
  30. 30.Half of 34 =
  31. 31.Double 51 =
  32. 32.Double 71 =
  33. 33.Double 44 =
  34. 34.Half of 42 =
  35. 35.Double 37 =
  36. 36.Half of 120 =
  37. 37.Double 88 =
  38. 38.Half of 102 =
  39. 39.Double 34 =
  40. 40.Half of 160 =

Answer key

  1. 146
  2. 42
  3. 132
  4. 32
  5. 76
  6. 72
  7. 56
  8. 54
  9. 96
  10. 97
  11. 182
  12. 69
  13. 36
  14. 22
  15. 45
  16. 41
  17. 186
  18. 82
  19. 64
  20. 72
  21. 112
  22. 192
  23. 136
  24. 126
  25. 23
  26. 15
  27. 44
  28. 178
  29. 57
  30. 17
  31. 102
  32. 142
  33. 88
  34. 21
  35. 74
  36. 60
  37. 176
  38. 51
  39. 68
  40. 80

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