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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 941 · 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 21 =
  2. 2.Half of 186 =
  3. 3.Double 84 =
  4. 4.Double 67 =
  5. 5.Double 61 =
  6. 6.Half of 94 =
  7. 7.Double 53 =
  8. 8.Half of 42 =
  9. 9.Half of 160 =
  10. 10.Double 47 =
  11. 11.Half of 50 =
  12. 12.Half of 138 =
  13. 13.Half of 102 =
  14. 14.Double 88 =
  15. 15.Half of 164 =
  16. 16.Half of 64 =
  17. 17.Double 26 =
  18. 18.Double 91 =
  19. 19.Half of 46 =
  20. 20.Half of 136 =
  21. 21.Half of 38 =
  22. 22.Half of 180 =
  23. 23.Half of 134 =
  24. 24.Half of 92 =
  25. 25.Double 54 =
  26. 26.Double 29 =
  27. 27.Half of 118 =
  28. 28.Half of 112 =
  29. 29.Half of 48 =
  30. 30.Double 75 =
  31. 31.Half of 104 =
  32. 32.Half of 62 =
  33. 33.Half of 60 =
  34. 34.Half of 194 =
  35. 35.Half of 32 =
  36. 36.Double 31 =
  37. 37.Double 97 =
  38. 38.Double 85 =
  39. 39.Double 55 =
  40. 40.Double 24 =

Answer key

  1. 42
  2. 93
  3. 168
  4. 134
  5. 122
  6. 47
  7. 106
  8. 21
  9. 80
  10. 94
  11. 25
  12. 69
  13. 51
  14. 176
  15. 82
  16. 32
  17. 52
  18. 182
  19. 23
  20. 68
  21. 19
  22. 90
  23. 67
  24. 46
  25. 108
  26. 58
  27. 59
  28. 56
  29. 24
  30. 150
  31. 52
  32. 31
  33. 30
  34. 97
  35. 16
  36. 62
  37. 194
  38. 170
  39. 110
  40. 48

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