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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 853 · 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 48 =
  2. 2.Half of 66 =
  3. 3.Double 51 =
  4. 4.Double 85 =
  5. 5.Double 55 =
  6. 6.Double 28 =
  7. 7.Half of 184 =
  8. 8.Double 82 =
  9. 9.Half of 186 =
  10. 10.Half of 196 =
  11. 11.Half of 194 =
  12. 12.Double 63 =
  13. 13.Double 57 =
  14. 14.Half of 192 =
  15. 15.Double 52 =
  16. 16.Double 43 =
  17. 17.Half of 70 =
  18. 18.Half of 100 =
  19. 19.Half of 48 =
  20. 20.Half of 30 =
  21. 21.Half of 134 =
  22. 22.Double 22 =
  23. 23.Double 32 =
  24. 24.Half of 104 =
  25. 25.Double 76 =
  26. 26.Half of 26 =
  27. 27.Double 29 =
  28. 28.Half of 32 =
  29. 29.Double 37 =
  30. 30.Double 45 =
  31. 31.Half of 182 =
  32. 32.Half of 150 =
  33. 33.Double 19 =
  34. 34.Half of 36 =
  35. 35.Double 42 =
  36. 36.Half of 128 =
  37. 37.Double 93 =
  38. 38.Half of 172 =
  39. 39.Half of 64 =
  40. 40.Double 95 =

Answer key

  1. 96
  2. 33
  3. 102
  4. 170
  5. 110
  6. 56
  7. 92
  8. 164
  9. 93
  10. 98
  11. 97
  12. 126
  13. 114
  14. 96
  15. 104
  16. 86
  17. 35
  18. 50
  19. 24
  20. 15
  21. 67
  22. 44
  23. 64
  24. 52
  25. 152
  26. 13
  27. 58
  28. 16
  29. 74
  30. 90
  31. 91
  32. 75
  33. 38
  34. 18
  35. 84
  36. 64
  37. 186
  38. 86
  39. 32
  40. 190

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