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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 261 · 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 104 =
  2. 2.Half of 46 =
  3. 3.Double 31 =
  4. 4.Double 28 =
  5. 5.Double 33 =
  6. 6.Double 83 =
  7. 7.Double 72 =
  8. 8.Half of 32 =
  9. 9.Half of 174 =
  10. 10.Double 63 =
  11. 11.Double 94 =
  12. 12.Double 32 =
  13. 13.Half of 136 =
  14. 14.Half of 192 =
  15. 15.Half of 176 =
  16. 16.Half of 188 =
  17. 17.Double 97 =
  18. 18.Half of 34 =
  19. 19.Half of 70 =
  20. 20.Double 26 =
  21. 21.Double 16 =
  22. 22.Double 51 =
  23. 23.Half of 194 =
  24. 24.Double 92 =
  25. 25.Half of 72 =
  26. 26.Half of 88 =
  27. 27.Half of 186 =
  28. 28.Half of 28 =
  29. 29.Double 34 =
  30. 30.Double 21 =
  31. 31.Double 61 =
  32. 32.Half of 134 =
  33. 33.Half of 50 =
  34. 34.Half of 44 =
  35. 35.Double 35 =
  36. 36.Double 23 =
  37. 37.Half of 48 =
  38. 38.Half of 148 =
  39. 39.Double 47 =
  40. 40.Half of 82 =

Answer key

  1. 52
  2. 23
  3. 62
  4. 56
  5. 66
  6. 166
  7. 144
  8. 16
  9. 87
  10. 126
  11. 188
  12. 64
  13. 68
  14. 96
  15. 88
  16. 94
  17. 194
  18. 17
  19. 35
  20. 52
  21. 32
  22. 102
  23. 97
  24. 184
  25. 36
  26. 44
  27. 93
  28. 14
  29. 68
  30. 42
  31. 122
  32. 67
  33. 25
  34. 22
  35. 70
  36. 46
  37. 24
  38. 74
  39. 94
  40. 41

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