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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 895 · 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 91 =
  2. 2.Half of 36 =
  3. 3.Half of 62 =
  4. 4.Double 45 =
  5. 5.Half of 50 =
  6. 6.Double 57 =
  7. 7.Double 83 =
  8. 8.Half of 166 =
  9. 9.Half of 54 =
  10. 10.Double 41 =
  11. 11.Double 39 =
  12. 12.Half of 194 =
  13. 13.Double 43 =
  14. 14.Double 48 =
  15. 15.Half of 42 =
  16. 16.Double 65 =
  17. 17.Double 55 =
  18. 18.Half of 186 =
  19. 19.Half of 154 =
  20. 20.Double 78 =
  21. 21.Double 76 =
  22. 22.Double 56 =
  23. 23.Double 47 =
  24. 24.Double 33 =
  25. 25.Half of 76 =
  26. 26.Half of 26 =
  27. 27.Double 22 =
  28. 28.Half of 110 =
  29. 29.Double 92 =
  30. 30.Double 32 =
  31. 31.Half of 150 =
  32. 32.Half of 66 =
  33. 33.Half of 52 =
  34. 34.Half of 46 =
  35. 35.Double 62 =
  36. 36.Double 23 =
  37. 37.Half of 148 =
  38. 38.Half of 136 =
  39. 39.Half of 32 =
  40. 40.Half of 120 =

Answer key

  1. 182
  2. 18
  3. 31
  4. 90
  5. 25
  6. 114
  7. 166
  8. 83
  9. 27
  10. 82
  11. 78
  12. 97
  13. 86
  14. 96
  15. 21
  16. 130
  17. 110
  18. 93
  19. 77
  20. 156
  21. 152
  22. 112
  23. 94
  24. 66
  25. 38
  26. 13
  27. 44
  28. 55
  29. 184
  30. 64
  31. 75
  32. 33
  33. 26
  34. 23
  35. 124
  36. 46
  37. 74
  38. 68
  39. 16
  40. 60

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