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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 996 · 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 65 =
  2. 2.Double 71 =
  3. 3.Half of 94 =
  4. 4.Half of 178 =
  5. 5.Half of 136 =
  6. 6.Half of 152 =
  7. 7.Half of 30 =
  8. 8.Half of 40 =
  9. 9.Half of 140 =
  10. 10.Half of 120 =
  11. 11.Half of 76 =
  12. 12.Double 51 =
  13. 13.Double 52 =
  14. 14.Double 59 =
  15. 15.Half of 192 =
  16. 16.Half of 116 =
  17. 17.Double 96 =
  18. 18.Double 17 =
  19. 19.Half of 48 =
  20. 20.Double 56 =
  21. 21.Double 63 =
  22. 22.Double 92 =
  23. 23.Double 93 =
  24. 24.Double 21 =
  25. 25.Double 41 =
  26. 26.Double 89 =
  27. 27.Half of 186 =
  28. 28.Double 82 =
  29. 29.Half of 68 =
  30. 30.Double 23 =
  31. 31.Half of 166 =
  32. 32.Double 58 =
  33. 33.Half of 164 =
  34. 34.Double 69 =
  35. 35.Half of 106 =
  36. 36.Double 44 =
  37. 37.Double 27 =
  38. 38.Half of 44 =
  39. 39.Double 25 =
  40. 40.Double 33 =

Answer key

  1. 130
  2. 142
  3. 47
  4. 89
  5. 68
  6. 76
  7. 15
  8. 20
  9. 70
  10. 60
  11. 38
  12. 102
  13. 104
  14. 118
  15. 96
  16. 58
  17. 192
  18. 34
  19. 24
  20. 112
  21. 126
  22. 184
  23. 186
  24. 42
  25. 82
  26. 178
  27. 93
  28. 164
  29. 34
  30. 46
  31. 83
  32. 116
  33. 82
  34. 138
  35. 53
  36. 88
  37. 54
  38. 22
  39. 50
  40. 66

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