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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 842 · 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 85 =
  2. 2.Half of 190 =
  3. 3.Half of 150 =
  4. 4.Half of 38 =
  5. 5.Half of 194 =
  6. 6.Double 81 =
  7. 7.Double 67 =
  8. 8.Half of 180 =
  9. 9.Double 47 =
  10. 10.Half of 128 =
  11. 11.Double 92 =
  12. 12.Double 28 =
  13. 13.Double 55 =
  14. 14.Half of 28 =
  15. 15.Double 27 =
  16. 16.Half of 172 =
  17. 17.Half of 40 =
  18. 18.Double 71 =
  19. 19.Double 57 =
  20. 20.Half of 66 =
  21. 21.Double 98 =
  22. 22.Double 41 =
  23. 23.Double 73 =
  24. 24.Double 61 =
  25. 25.Half of 170 =
  26. 26.Half of 44 =
  27. 27.Half of 142 =
  28. 28.Double 62 =
  29. 29.Double 16 =
  30. 30.Half of 102 =
  31. 31.Half of 60 =
  32. 32.Double 74 =
  33. 33.Double 39 =
  34. 34.Double 52 =
  35. 35.Double 65 =
  36. 36.Half of 42 =
  37. 37.Half of 74 =
  38. 38.Double 84 =
  39. 39.Half of 98 =
  40. 40.Double 25 =

Answer key

  1. 170
  2. 95
  3. 75
  4. 19
  5. 97
  6. 162
  7. 134
  8. 90
  9. 94
  10. 64
  11. 184
  12. 56
  13. 110
  14. 14
  15. 54
  16. 86
  17. 20
  18. 142
  19. 114
  20. 33
  21. 196
  22. 82
  23. 146
  24. 122
  25. 85
  26. 22
  27. 71
  28. 124
  29. 32
  30. 51
  31. 30
  32. 148
  33. 78
  34. 104
  35. 130
  36. 21
  37. 37
  38. 168
  39. 49
  40. 50

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