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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 957 · 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 16 =
  2. 2.Half of 44 =
  3. 3.Double 65 =
  4. 4.Double 18 =
  5. 5.Double 41 =
  6. 6.Double 75 =
  7. 7.Half of 28 =
  8. 8.Double 26 =
  9. 9.Double 51 =
  10. 10.Double 78 =
  11. 11.Double 63 =
  12. 12.Half of 58 =
  13. 13.Double 74 =
  14. 14.Double 69 =
  15. 15.Half of 118 =
  16. 16.Half of 168 =
  17. 17.Half of 62 =
  18. 18.Half of 76 =
  19. 19.Half of 188 =
  20. 20.Half of 80 =
  21. 21.Double 96 =
  22. 22.Double 58 =
  23. 23.Half of 48 =
  24. 24.Half of 38 =
  25. 25.Half of 150 =
  26. 26.Double 28 =
  27. 27.Double 31 =
  28. 28.Half of 60 =
  29. 29.Half of 32 =
  30. 30.Double 48 =
  31. 31.Double 88 =
  32. 32.Double 71 =
  33. 33.Half of 50 =
  34. 34.Half of 148 =
  35. 35.Double 81 =
  36. 36.Half of 144 =
  37. 37.Double 79 =
  38. 38.Half of 182 =
  39. 39.Double 22 =
  40. 40.Double 67 =

Answer key

  1. 32
  2. 22
  3. 130
  4. 36
  5. 82
  6. 150
  7. 14
  8. 52
  9. 102
  10. 156
  11. 126
  12. 29
  13. 148
  14. 138
  15. 59
  16. 84
  17. 31
  18. 38
  19. 94
  20. 40
  21. 192
  22. 116
  23. 24
  24. 19
  25. 75
  26. 56
  27. 62
  28. 30
  29. 16
  30. 96
  31. 176
  32. 142
  33. 25
  34. 74
  35. 162
  36. 72
  37. 158
  38. 91
  39. 44
  40. 134

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