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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 878 · 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 89 =
  2. 2.Double 91 =
  3. 3.Half of 150 =
  4. 4.Half of 100 =
  5. 5.Double 69 =
  6. 6.Double 56 =
  7. 7.Half of 172 =
  8. 8.Double 92 =
  9. 9.Double 71 =
  10. 10.Double 81 =
  11. 11.Half of 36 =
  12. 12.Double 39 =
  13. 13.Double 78 =
  14. 14.Half of 174 =
  15. 15.Double 76 =
  16. 16.Half of 56 =
  17. 17.Double 62 =
  18. 18.Half of 102 =
  19. 19.Double 85 =
  20. 20.Half of 138 =
  21. 21.Half of 194 =
  22. 22.Double 95 =
  23. 23.Half of 26 =
  24. 24.Double 34 =
  25. 25.Double 35 =
  26. 26.Half of 192 =
  27. 27.Half of 90 =
  28. 28.Double 24 =
  29. 29.Double 27 =
  30. 30.Half of 158 =
  31. 31.Half of 42 =
  32. 32.Double 72 =
  33. 33.Double 31 =
  34. 34.Double 49 =
  35. 35.Half of 78 =
  36. 36.Half of 50 =
  37. 37.Double 17 =
  38. 38.Double 29 =
  39. 39.Half of 76 =
  40. 40.Half of 178 =

Answer key

  1. 178
  2. 182
  3. 75
  4. 50
  5. 138
  6. 112
  7. 86
  8. 184
  9. 142
  10. 162
  11. 18
  12. 78
  13. 156
  14. 87
  15. 152
  16. 28
  17. 124
  18. 51
  19. 170
  20. 69
  21. 97
  22. 190
  23. 13
  24. 68
  25. 70
  26. 96
  27. 45
  28. 48
  29. 54
  30. 79
  31. 21
  32. 144
  33. 62
  34. 98
  35. 39
  36. 25
  37. 34
  38. 58
  39. 38
  40. 89

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