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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 849 · 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 32 =
  2. 2.Double 77 =
  3. 3.Half of 190 =
  4. 4.Half of 74 =
  5. 5.Half of 28 =
  6. 6.Double 88 =
  7. 7.Double 61 =
  8. 8.Half of 106 =
  9. 9.Double 31 =
  10. 10.Double 51 =
  11. 11.Half of 64 =
  12. 12.Half of 60 =
  13. 13.Half of 182 =
  14. 14.Half of 112 =
  15. 15.Half of 66 =
  16. 16.Half of 80 =
  17. 17.Half of 38 =
  18. 18.Half of 130 =
  19. 19.Half of 198 =
  20. 20.Double 54 =
  21. 21.Half of 88 =
  22. 22.Double 22 =
  23. 23.Double 47 =
  24. 24.Half of 90 =
  25. 25.Double 48 =
  26. 26.Double 86 =
  27. 27.Half of 62 =
  28. 28.Double 52 =
  29. 29.Double 56 =
  30. 30.Half of 40 =
  31. 31.Half of 48 =
  32. 32.Half of 54 =
  33. 33.Double 26 =
  34. 34.Half of 148 =
  35. 35.Double 42 =
  36. 36.Half of 58 =
  37. 37.Half of 70 =
  38. 38.Double 98 =
  39. 39.Double 16 =
  40. 40.Half of 156 =

Answer key

  1. 64
  2. 154
  3. 95
  4. 37
  5. 14
  6. 176
  7. 122
  8. 53
  9. 62
  10. 102
  11. 32
  12. 30
  13. 91
  14. 56
  15. 33
  16. 40
  17. 19
  18. 65
  19. 99
  20. 108
  21. 44
  22. 44
  23. 94
  24. 45
  25. 96
  26. 172
  27. 31
  28. 104
  29. 112
  30. 20
  31. 24
  32. 27
  33. 52
  34. 74
  35. 84
  36. 29
  37. 35
  38. 196
  39. 32
  40. 78

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