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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 870 · 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 76 =
  2. 2.Half of 148 =
  3. 3.Half of 66 =
  4. 4.Half of 102 =
  5. 5.Double 36 =
  6. 6.Double 19 =
  7. 7.Half of 94 =
  8. 8.Half of 176 =
  9. 9.Double 79 =
  10. 10.Half of 138 =
  11. 11.Double 28 =
  12. 12.Double 69 =
  13. 13.Double 34 =
  14. 14.Half of 56 =
  15. 15.Half of 154 =
  16. 16.Double 46 =
  17. 17.Double 87 =
  18. 18.Half of 186 =
  19. 19.Double 35 =
  20. 20.Double 85 =
  21. 21.Double 55 =
  22. 22.Double 52 =
  23. 23.Half of 150 =
  24. 24.Double 91 =
  25. 25.Half of 182 =
  26. 26.Double 62 =
  27. 27.Half of 78 =
  28. 28.Double 47 =
  29. 29.Half of 174 =
  30. 30.Double 71 =
  31. 31.Half of 158 =
  32. 32.Half of 128 =
  33. 33.Half of 132 =
  34. 34.Double 37 =
  35. 35.Half of 46 =
  36. 36.Double 29 =
  37. 37.Half of 88 =
  38. 38.Double 94 =
  39. 39.Half of 196 =
  40. 40.Half of 112 =

Answer key

  1. 152
  2. 74
  3. 33
  4. 51
  5. 72
  6. 38
  7. 47
  8. 88
  9. 158
  10. 69
  11. 56
  12. 138
  13. 68
  14. 28
  15. 77
  16. 92
  17. 174
  18. 93
  19. 70
  20. 170
  21. 110
  22. 104
  23. 75
  24. 182
  25. 91
  26. 124
  27. 39
  28. 94
  29. 87
  30. 142
  31. 79
  32. 64
  33. 66
  34. 74
  35. 23
  36. 58
  37. 44
  38. 188
  39. 98
  40. 56

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