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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 476 · 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 47 =
  2. 2.Half of 94 =
  3. 3.Half of 126 =
  4. 4.Double 67 =
  5. 5.Double 25 =
  6. 6.Double 91 =
  7. 7.Half of 40 =
  8. 8.Double 22 =
  9. 9.Double 38 =
  10. 10.Double 32 =
  11. 11.Half of 122 =
  12. 12.Half of 108 =
  13. 13.Double 41 =
  14. 14.Double 66 =
  15. 15.Half of 156 =
  16. 16.Half of 196 =
  17. 17.Half of 72 =
  18. 18.Double 28 =
  19. 19.Double 31 =
  20. 20.Half of 150 =
  21. 21.Half of 36 =
  22. 22.Half of 32 =
  23. 23.Half of 30 =
  24. 24.Double 29 =
  25. 25.Double 94 =
  26. 26.Double 58 =
  27. 27.Half of 54 =
  28. 28.Double 89 =
  29. 29.Half of 172 =
  30. 30.Double 82 =
  31. 31.Double 16 =
  32. 32.Double 78 =
  33. 33.Half of 52 =
  34. 34.Double 64 =
  35. 35.Double 97 =
  36. 36.Half of 64 =
  37. 37.Double 46 =
  38. 38.Half of 198 =
  39. 39.Double 98 =
  40. 40.Half of 96 =

Answer key

  1. 94
  2. 47
  3. 63
  4. 134
  5. 50
  6. 182
  7. 20
  8. 44
  9. 76
  10. 64
  11. 61
  12. 54
  13. 82
  14. 132
  15. 78
  16. 98
  17. 36
  18. 56
  19. 62
  20. 75
  21. 18
  22. 16
  23. 15
  24. 58
  25. 188
  26. 116
  27. 27
  28. 178
  29. 86
  30. 164
  31. 32
  32. 156
  33. 26
  34. 128
  35. 194
  36. 32
  37. 92
  38. 99
  39. 196
  40. 48

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