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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 599 · 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 126 =
  2. 2.Half of 128 =
  3. 3.Double 25 =
  4. 4.Double 74 =
  5. 5.Half of 136 =
  6. 6.Half of 106 =
  7. 7.Double 41 =
  8. 8.Half of 164 =
  9. 9.Double 28 =
  10. 10.Double 68 =
  11. 11.Half of 198 =
  12. 12.Double 57 =
  13. 13.Double 52 =
  14. 14.Double 79 =
  15. 15.Double 39 =
  16. 16.Double 24 =
  17. 17.Half of 64 =
  18. 18.Double 42 =
  19. 19.Double 21 =
  20. 20.Half of 80 =
  21. 21.Double 75 =
  22. 22.Double 91 =
  23. 23.Half of 104 =
  24. 24.Half of 182 =
  25. 25.Half of 170 =
  26. 26.Double 63 =
  27. 27.Double 31 =
  28. 28.Half of 168 =
  29. 29.Double 51 =
  30. 30.Double 81 =
  31. 31.Half of 42 =
  32. 32.Half of 30 =
  33. 33.Half of 190 =
  34. 34.Half of 68 =
  35. 35.Double 76 =
  36. 36.Half of 114 =
  37. 37.Half of 192 =
  38. 38.Half of 174 =
  39. 39.Half of 144 =
  40. 40.Double 16 =

Answer key

  1. 63
  2. 64
  3. 50
  4. 148
  5. 68
  6. 53
  7. 82
  8. 82
  9. 56
  10. 136
  11. 99
  12. 114
  13. 104
  14. 158
  15. 78
  16. 48
  17. 32
  18. 84
  19. 42
  20. 40
  21. 150
  22. 182
  23. 52
  24. 91
  25. 85
  26. 126
  27. 62
  28. 84
  29. 102
  30. 162
  31. 21
  32. 15
  33. 95
  34. 34
  35. 152
  36. 57
  37. 96
  38. 87
  39. 72
  40. 32

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