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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 930 · 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 86 =
  2. 2.Half of 186 =
  3. 3.Double 73 =
  4. 4.Double 39 =
  5. 5.Double 51 =
  6. 6.Half of 188 =
  7. 7.Half of 156 =
  8. 8.Half of 54 =
  9. 9.Double 44 =
  10. 10.Half of 168 =
  11. 11.Double 34 =
  12. 12.Double 22 =
  13. 13.Half of 58 =
  14. 14.Half of 126 =
  15. 15.Half of 136 =
  16. 16.Half of 112 =
  17. 17.Double 87 =
  18. 18.Double 35 =
  19. 19.Double 28 =
  20. 20.Double 29 =
  21. 21.Half of 154 =
  22. 22.Half of 88 =
  23. 23.Double 57 =
  24. 24.Half of 52 =
  25. 25.Double 89 =
  26. 26.Half of 194 =
  27. 27.Double 24 =
  28. 28.Half of 48 =
  29. 29.Double 67 =
  30. 30.Double 43 =
  31. 31.Double 32 =
  32. 32.Half of 148 =
  33. 33.Half of 140 =
  34. 34.Double 66 =
  35. 35.Half of 100 =
  36. 36.Double 21 =
  37. 37.Half of 28 =
  38. 38.Double 81 =
  39. 39.Double 68 =
  40. 40.Double 88 =

Answer key

  1. 43
  2. 93
  3. 146
  4. 78
  5. 102
  6. 94
  7. 78
  8. 27
  9. 88
  10. 84
  11. 68
  12. 44
  13. 29
  14. 63
  15. 68
  16. 56
  17. 174
  18. 70
  19. 56
  20. 58
  21. 77
  22. 44
  23. 114
  24. 26
  25. 178
  26. 97
  27. 48
  28. 24
  29. 134
  30. 86
  31. 64
  32. 74
  33. 70
  34. 132
  35. 50
  36. 42
  37. 14
  38. 162
  39. 136
  40. 176

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