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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 583 · 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 98 =
  2. 2.Double 27 =
  3. 3.Double 88 =
  4. 4.Double 97 =
  5. 5.Half of 180 =
  6. 6.Double 21 =
  7. 7.Double 67 =
  8. 8.Double 61 =
  9. 9.Double 18 =
  10. 10.Half of 44 =
  11. 11.Half of 170 =
  12. 12.Half of 42 =
  13. 13.Double 91 =
  14. 14.Half of 52 =
  15. 15.Double 46 =
  16. 16.Double 72 =
  17. 17.Double 48 =
  18. 18.Double 53 =
  19. 19.Half of 118 =
  20. 20.Double 95 =
  21. 21.Double 71 =
  22. 22.Half of 64 =
  23. 23.Half of 28 =
  24. 24.Half of 196 =
  25. 25.Double 59 =
  26. 26.Half of 78 =
  27. 27.Half of 36 =
  28. 28.Half of 116 =
  29. 29.Half of 194 =
  30. 30.Half of 74 =
  31. 31.Half of 60 =
  32. 32.Half of 92 =
  33. 33.Double 64 =
  34. 34.Double 85 =
  35. 35.Double 99 =
  36. 36.Half of 26 =
  37. 37.Half of 54 =
  38. 38.Double 54 =
  39. 39.Double 29 =
  40. 40.Double 44 =

Answer key

  1. 49
  2. 54
  3. 176
  4. 194
  5. 90
  6. 42
  7. 134
  8. 122
  9. 36
  10. 22
  11. 85
  12. 21
  13. 182
  14. 26
  15. 92
  16. 144
  17. 96
  18. 106
  19. 59
  20. 190
  21. 142
  22. 32
  23. 14
  24. 98
  25. 118
  26. 39
  27. 18
  28. 58
  29. 97
  30. 37
  31. 30
  32. 46
  33. 128
  34. 170
  35. 198
  36. 13
  37. 27
  38. 108
  39. 58
  40. 88

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