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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 985 · 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 170 =
  2. 2.Double 81 =
  3. 3.Double 62 =
  4. 4.Half of 64 =
  5. 5.Half of 94 =
  6. 6.Double 88 =
  7. 7.Double 47 =
  8. 8.Half of 56 =
  9. 9.Double 79 =
  10. 10.Double 23 =
  11. 11.Half of 58 =
  12. 12.Double 82 =
  13. 13.Half of 198 =
  14. 14.Double 97 =
  15. 15.Double 57 =
  16. 16.Half of 180 =
  17. 17.Double 69 =
  18. 18.Double 94 =
  19. 19.Double 61 =
  20. 20.Half of 38 =
  21. 21.Double 31 =
  22. 22.Double 95 =
  23. 23.Half of 66 =
  24. 24.Double 22 =
  25. 25.Double 27 =
  26. 26.Half of 96 =
  27. 27.Double 28 =
  28. 28.Half of 68 =
  29. 29.Double 59 =
  30. 30.Half of 178 =
  31. 31.Double 72 =
  32. 32.Half of 184 =
  33. 33.Double 21 =
  34. 34.Half of 132 =
  35. 35.Double 56 =
  36. 36.Half of 52 =
  37. 37.Double 26 =
  38. 38.Double 67 =
  39. 39.Double 45 =
  40. 40.Double 36 =

Answer key

  1. 85
  2. 162
  3. 124
  4. 32
  5. 47
  6. 176
  7. 94
  8. 28
  9. 158
  10. 46
  11. 29
  12. 164
  13. 99
  14. 194
  15. 114
  16. 90
  17. 138
  18. 188
  19. 122
  20. 19
  21. 62
  22. 190
  23. 33
  24. 44
  25. 54
  26. 48
  27. 56
  28. 34
  29. 118
  30. 89
  31. 144
  32. 92
  33. 42
  34. 66
  35. 112
  36. 26
  37. 52
  38. 134
  39. 90
  40. 72

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