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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 989 · 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 56 =
  2. 2.Double 74 =
  3. 3.Double 17 =
  4. 4.Half of 170 =
  5. 5.Double 26 =
  6. 6.Double 92 =
  7. 7.Half of 46 =
  8. 8.Double 34 =
  9. 9.Double 83 =
  10. 10.Double 23 =
  11. 11.Half of 58 =
  12. 12.Double 41 =
  13. 13.Double 98 =
  14. 14.Double 29 =
  15. 15.Double 35 =
  16. 16.Half of 188 =
  17. 17.Double 66 =
  18. 18.Half of 152 =
  19. 19.Half of 102 =
  20. 20.Half of 44 =
  21. 21.Double 93 =
  22. 22.Half of 174 =
  23. 23.Double 61 =
  24. 24.Double 42 =
  25. 25.Double 28 =
  26. 26.Half of 182 =
  27. 27.Double 82 =
  28. 28.Double 64 =
  29. 29.Half of 192 =
  30. 30.Double 77 =
  31. 31.Double 39 =
  32. 32.Half of 184 =
  33. 33.Half of 48 =
  34. 34.Half of 26 =
  35. 35.Double 32 =
  36. 36.Double 31 =
  37. 37.Half of 60 =
  38. 38.Double 62 =
  39. 39.Half of 70 =
  40. 40.Half of 54 =

Answer key

  1. 28
  2. 148
  3. 34
  4. 85
  5. 52
  6. 184
  7. 23
  8. 68
  9. 166
  10. 46
  11. 29
  12. 82
  13. 196
  14. 58
  15. 70
  16. 94
  17. 132
  18. 76
  19. 51
  20. 22
  21. 186
  22. 87
  23. 122
  24. 84
  25. 56
  26. 91
  27. 164
  28. 128
  29. 96
  30. 154
  31. 78
  32. 92
  33. 24
  34. 13
  35. 64
  36. 62
  37. 30
  38. 124
  39. 35
  40. 27

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