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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 875 · 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 28 =
  2. 2.Double 96 =
  3. 3.Half of 26 =
  4. 4.Double 97 =
  5. 5.Half of 48 =
  6. 6.Half of 118 =
  7. 7.Half of 72 =
  8. 8.Double 59 =
  9. 9.Half of 64 =
  10. 10.Double 36 =
  11. 11.Double 28 =
  12. 12.Half of 62 =
  13. 13.Half of 36 =
  14. 14.Half of 32 =
  15. 15.Half of 142 =
  16. 16.Double 69 =
  17. 17.Half of 168 =
  18. 18.Double 21 =
  19. 19.Double 17 =
  20. 20.Double 48 =
  21. 21.Half of 42 =
  22. 22.Double 35 =
  23. 23.Half of 74 =
  24. 24.Double 42 =
  25. 25.Double 82 =
  26. 26.Half of 34 =
  27. 27.Double 29 =
  28. 28.Double 41 =
  29. 29.Double 95 =
  30. 30.Double 58 =
  31. 31.Double 72 =
  32. 32.Double 53 =
  33. 33.Half of 158 =
  34. 34.Half of 188 =
  35. 35.Double 19 =
  36. 36.Half of 180 =
  37. 37.Half of 102 =
  38. 38.Double 54 =
  39. 39.Double 89 =
  40. 40.Double 93 =

Answer key

  1. 14
  2. 192
  3. 13
  4. 194
  5. 24
  6. 59
  7. 36
  8. 118
  9. 32
  10. 72
  11. 56
  12. 31
  13. 18
  14. 16
  15. 71
  16. 138
  17. 84
  18. 42
  19. 34
  20. 96
  21. 21
  22. 70
  23. 37
  24. 84
  25. 164
  26. 17
  27. 58
  28. 82
  29. 190
  30. 116
  31. 144
  32. 106
  33. 79
  34. 94
  35. 38
  36. 90
  37. 51
  38. 108
  39. 178
  40. 186

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