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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 888 · 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 64 =
  2. 2.Half of 38 =
  3. 3.Half of 28 =
  4. 4.Half of 132 =
  5. 5.Half of 64 =
  6. 6.Double 21 =
  7. 7.Double 24 =
  8. 8.Double 85 =
  9. 9.Half of 40 =
  10. 10.Double 27 =
  11. 11.Double 16 =
  12. 12.Half of 78 =
  13. 13.Half of 140 =
  14. 14.Half of 72 =
  15. 15.Double 35 =
  16. 16.Half of 160 =
  17. 17.Double 31 =
  18. 18.Double 33 =
  19. 19.Double 98 =
  20. 20.Half of 146 =
  21. 21.Double 41 =
  22. 22.Double 39 =
  23. 23.Half of 44 =
  24. 24.Double 61 =
  25. 25.Double 88 =
  26. 26.Double 69 =
  27. 27.Half of 148 =
  28. 28.Half of 36 =
  29. 29.Half of 66 =
  30. 30.Double 42 =
  31. 31.Half of 130 =
  32. 32.Half of 152 =
  33. 33.Double 71 =
  34. 34.Double 95 =
  35. 35.Double 34 =
  36. 36.Half of 128 =
  37. 37.Half of 30 =
  38. 38.Double 76 =
  39. 39.Double 43 =
  40. 40.Half of 68 =

Answer key

  1. 128
  2. 19
  3. 14
  4. 66
  5. 32
  6. 42
  7. 48
  8. 170
  9. 20
  10. 54
  11. 32
  12. 39
  13. 70
  14. 36
  15. 70
  16. 80
  17. 62
  18. 66
  19. 196
  20. 73
  21. 82
  22. 78
  23. 22
  24. 122
  25. 176
  26. 138
  27. 74
  28. 18
  29. 33
  30. 84
  31. 65
  32. 76
  33. 142
  34. 190
  35. 68
  36. 64
  37. 15
  38. 152
  39. 86
  40. 34

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