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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 955 · 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.Half of 44 =
  2. 2.Half of 38 =
  3. 3.Double 45 =
  4. 4.Half of 150 =
  5. 5.Half of 76 =
  6. 6.Double 91 =
  7. 7.Double 18 =
  8. 8.Double 37 =
  9. 9.Half of 94 =
  10. 10.Half of 166 =
  11. 11.Half of 36 =
  12. 12.Double 49 =
  13. 13.Half of 152 =
  14. 14.Half of 90 =
  15. 15.Double 56 =
  16. 16.Half of 78 =
  17. 17.Double 31 =
  18. 18.Double 59 =
  19. 19.Double 93 =
  20. 20.Half of 190 =
  21. 21.Double 54 =
  22. 22.Half of 82 =
  23. 23.Double 39 =
  24. 24.Double 42 =
  25. 25.Half of 96 =
  26. 26.Double 33 =
  27. 27.Half of 170 =
  28. 28.Half of 104 =
  29. 29.Double 98 =
  30. 30.Double 79 =
  31. 31.Double 99 =
  32. 32.Half of 162 =
  33. 33.Double 46 =
  34. 34.Half of 132 =
  35. 35.Double 21 =
  36. 36.Half of 116 =
  37. 37.Half of 60 =
  38. 38.Half of 146 =
  39. 39.Double 94 =
  40. 40.Half of 66 =

Answer key

  1. 22
  2. 19
  3. 90
  4. 75
  5. 38
  6. 182
  7. 36
  8. 74
  9. 47
  10. 83
  11. 18
  12. 98
  13. 76
  14. 45
  15. 112
  16. 39
  17. 62
  18. 118
  19. 186
  20. 95
  21. 108
  22. 41
  23. 78
  24. 84
  25. 48
  26. 66
  27. 85
  28. 52
  29. 196
  30. 158
  31. 198
  32. 81
  33. 92
  34. 66
  35. 42
  36. 58
  37. 30
  38. 73
  39. 188
  40. 33

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