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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 913 · 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 21 =
  2. 2.Double 81 =
  3. 3.Double 52 =
  4. 4.Double 86 =
  5. 5.Half of 130 =
  6. 6.Double 83 =
  7. 7.Double 88 =
  8. 8.Half of 102 =
  9. 9.Double 98 =
  10. 10.Half of 192 =
  11. 11.Double 82 =
  12. 12.Half of 148 =
  13. 13.Half of 44 =
  14. 14.Double 67 =
  15. 15.Half of 74 =
  16. 16.Double 77 =
  17. 17.Double 53 =
  18. 18.Half of 48 =
  19. 19.Double 99 =
  20. 20.Half of 50 =
  21. 21.Double 74 =
  22. 22.Double 33 =
  23. 23.Half of 170 =
  24. 24.Double 49 =
  25. 25.Double 22 =
  26. 26.Double 78 =
  27. 27.Double 19 =
  28. 28.Half of 108 =
  29. 29.Half of 36 =
  30. 30.Double 85 =
  31. 31.Half of 56 =
  32. 32.Double 56 =
  33. 33.Half of 54 =
  34. 34.Half of 124 =
  35. 35.Double 45 =
  36. 36.Half of 80 =
  37. 37.Double 58 =
  38. 38.Half of 196 =
  39. 39.Double 62 =
  40. 40.Double 69 =

Answer key

  1. 42
  2. 162
  3. 104
  4. 172
  5. 65
  6. 166
  7. 176
  8. 51
  9. 196
  10. 96
  11. 164
  12. 74
  13. 22
  14. 134
  15. 37
  16. 154
  17. 106
  18. 24
  19. 198
  20. 25
  21. 148
  22. 66
  23. 85
  24. 98
  25. 44
  26. 156
  27. 38
  28. 54
  29. 18
  30. 170
  31. 28
  32. 112
  33. 27
  34. 62
  35. 90
  36. 40
  37. 116
  38. 98
  39. 124
  40. 138

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