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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 993 · 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 92 =
  2. 2.Double 32 =
  3. 3.Double 61 =
  4. 4.Half of 110 =
  5. 5.Half of 192 =
  6. 6.Double 41 =
  7. 7.Half of 56 =
  8. 8.Double 34 =
  9. 9.Double 37 =
  10. 10.Double 21 =
  11. 11.Half of 72 =
  12. 12.Half of 42 =
  13. 13.Half of 40 =
  14. 14.Half of 122 =
  15. 15.Double 46 =
  16. 16.Double 31 =
  17. 17.Double 52 =
  18. 18.Double 51 =
  19. 19.Double 86 =
  20. 20.Half of 182 =
  21. 21.Double 44 =
  22. 22.Double 67 =
  23. 23.Double 16 =
  24. 24.Double 92 =
  25. 25.Double 48 =
  26. 26.Half of 76 =
  27. 27.Double 36 =
  28. 28.Half of 28 =
  29. 29.Half of 64 =
  30. 30.Double 54 =
  31. 31.Double 23 =
  32. 32.Half of 198 =
  33. 33.Half of 174 =
  34. 34.Double 78 =
  35. 35.Double 98 =
  36. 36.Double 47 =
  37. 37.Double 18 =
  38. 38.Half of 52 =
  39. 39.Half of 98 =
  40. 40.Half of 146 =

Answer key

  1. 46
  2. 64
  3. 122
  4. 55
  5. 96
  6. 82
  7. 28
  8. 68
  9. 74
  10. 42
  11. 36
  12. 21
  13. 20
  14. 61
  15. 92
  16. 62
  17. 104
  18. 102
  19. 172
  20. 91
  21. 88
  22. 134
  23. 32
  24. 184
  25. 96
  26. 38
  27. 72
  28. 14
  29. 32
  30. 108
  31. 46
  32. 99
  33. 87
  34. 156
  35. 196
  36. 94
  37. 36
  38. 26
  39. 49
  40. 73

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