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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 972 · 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 16 =
  2. 2.Double 54 =
  3. 3.Half of 44 =
  4. 4.Half of 40 =
  5. 5.Half of 48 =
  6. 6.Half of 28 =
  7. 7.Double 21 =
  8. 8.Half of 104 =
  9. 9.Half of 168 =
  10. 10.Half of 178 =
  11. 11.Double 32 =
  12. 12.Half of 128 =
  13. 13.Double 68 =
  14. 14.Double 37 =
  15. 15.Half of 122 =
  16. 16.Half of 130 =
  17. 17.Half of 162 =
  18. 18.Double 49 =
  19. 19.Half of 68 =
  20. 20.Double 55 =
  21. 21.Double 61 =
  22. 22.Double 29 =
  23. 23.Half of 56 =
  24. 24.Double 64 =
  25. 25.Half of 114 =
  26. 26.Double 31 =
  27. 27.Half of 196 =
  28. 28.Half of 46 =
  29. 29.Half of 126 =
  30. 30.Half of 146 =
  31. 31.Half of 192 =
  32. 32.Half of 58 =
  33. 33.Double 83 =
  34. 34.Double 35 =
  35. 35.Half of 60 =
  36. 36.Half of 86 =
  37. 37.Half of 172 =
  38. 38.Double 27 =
  39. 39.Double 94 =
  40. 40.Double 76 =

Answer key

  1. 32
  2. 108
  3. 22
  4. 20
  5. 24
  6. 14
  7. 42
  8. 52
  9. 84
  10. 89
  11. 64
  12. 64
  13. 136
  14. 74
  15. 61
  16. 65
  17. 81
  18. 98
  19. 34
  20. 110
  21. 122
  22. 58
  23. 28
  24. 128
  25. 57
  26. 62
  27. 98
  28. 23
  29. 63
  30. 73
  31. 96
  32. 29
  33. 166
  34. 70
  35. 30
  36. 43
  37. 86
  38. 54
  39. 188
  40. 152

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