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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 997 · 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 128 =
  2. 2.Half of 156 =
  3. 3.Half of 140 =
  4. 4.Double 73 =
  5. 5.Double 17 =
  6. 6.Half of 74 =
  7. 7.Double 65 =
  8. 8.Double 28 =
  9. 9.Double 77 =
  10. 10.Double 56 =
  11. 11.Double 83 =
  12. 12.Half of 40 =
  13. 13.Half of 48 =
  14. 14.Double 58 =
  15. 15.Half of 98 =
  16. 16.Half of 126 =
  17. 17.Double 71 =
  18. 18.Double 37 =
  19. 19.Double 96 =
  20. 20.Double 64 =
  21. 21.Double 49 =
  22. 22.Half of 78 =
  23. 23.Half of 36 =
  24. 24.Double 52 =
  25. 25.Half of 104 =
  26. 26.Half of 146 =
  27. 27.Double 35 =
  28. 28.Double 87 =
  29. 29.Double 48 =
  30. 30.Half of 30 =
  31. 31.Double 94 =
  32. 32.Double 91 =
  33. 33.Half of 198 =
  34. 34.Double 53 =
  35. 35.Half of 118 =
  36. 36.Double 25 =
  37. 37.Half of 142 =
  38. 38.Double 76 =
  39. 39.Half of 56 =
  40. 40.Double 81 =

Answer key

  1. 64
  2. 78
  3. 70
  4. 146
  5. 34
  6. 37
  7. 130
  8. 56
  9. 154
  10. 112
  11. 166
  12. 20
  13. 24
  14. 116
  15. 49
  16. 63
  17. 142
  18. 74
  19. 192
  20. 128
  21. 98
  22. 39
  23. 18
  24. 104
  25. 52
  26. 73
  27. 70
  28. 174
  29. 96
  30. 15
  31. 188
  32. 182
  33. 99
  34. 106
  35. 59
  36. 50
  37. 71
  38. 152
  39. 28
  40. 162

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