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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 674 · 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 42 =
  2. 2.Double 88 =
  3. 3.Double 51 =
  4. 4.Half of 138 =
  5. 5.Double 44 =
  6. 6.Half of 80 =
  7. 7.Half of 60 =
  8. 8.Double 65 =
  9. 9.Half of 160 =
  10. 10.Double 35 =
  11. 11.Double 25 =
  12. 12.Half of 118 =
  13. 13.Double 16 =
  14. 14.Half of 68 =
  15. 15.Double 39 =
  16. 16.Double 79 =
  17. 17.Half of 48 =
  18. 18.Half of 112 =
  19. 19.Half of 166 =
  20. 20.Half of 180 =
  21. 21.Double 21 =
  22. 22.Double 58 =
  23. 23.Double 78 =
  24. 24.Double 31 =
  25. 25.Double 66 =
  26. 26.Half of 188 =
  27. 27.Double 32 =
  28. 28.Double 36 =
  29. 29.Half of 86 =
  30. 30.Half of 66 =
  31. 31.Double 76 =
  32. 32.Double 33 =
  33. 33.Half of 110 =
  34. 34.Double 85 =
  35. 35.Half of 54 =
  36. 36.Double 59 =
  37. 37.Half of 88 =
  38. 38.Half of 94 =
  39. 39.Double 28 =
  40. 40.Double 26 =

Answer key

  1. 84
  2. 176
  3. 102
  4. 69
  5. 88
  6. 40
  7. 30
  8. 130
  9. 80
  10. 70
  11. 50
  12. 59
  13. 32
  14. 34
  15. 78
  16. 158
  17. 24
  18. 56
  19. 83
  20. 90
  21. 42
  22. 116
  23. 156
  24. 62
  25. 132
  26. 94
  27. 64
  28. 72
  29. 43
  30. 33
  31. 152
  32. 66
  33. 55
  34. 170
  35. 27
  36. 118
  37. 44
  38. 47
  39. 56
  40. 52

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