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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 656 · 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 57 =
  2. 2.Double 76 =
  3. 3.Half of 90 =
  4. 4.Half of 84 =
  5. 5.Double 87 =
  6. 6.Double 67 =
  7. 7.Double 17 =
  8. 8.Double 43 =
  9. 9.Half of 192 =
  10. 10.Double 26 =
  11. 11.Half of 100 =
  12. 12.Double 48 =
  13. 13.Double 24 =
  14. 14.Double 74 =
  15. 15.Double 62 =
  16. 16.Double 71 =
  17. 17.Half of 156 =
  18. 18.Double 98 =
  19. 19.Double 61 =
  20. 20.Half of 112 =
  21. 21.Half of 34 =
  22. 22.Half of 36 =
  23. 23.Half of 40 =
  24. 24.Half of 138 =
  25. 25.Double 18 =
  26. 26.Half of 176 =
  27. 27.Double 44 =
  28. 28.Double 52 =
  29. 29.Double 31 =
  30. 30.Double 55 =
  31. 31.Half of 128 =
  32. 32.Double 64 =
  33. 33.Half of 190 =
  34. 34.Double 33 =
  35. 35.Half of 116 =
  36. 36.Double 54 =
  37. 37.Half of 114 =
  38. 38.Half of 142 =
  39. 39.Half of 74 =
  40. 40.Double 66 =

Answer key

  1. 114
  2. 152
  3. 45
  4. 42
  5. 174
  6. 134
  7. 34
  8. 86
  9. 96
  10. 52
  11. 50
  12. 96
  13. 48
  14. 148
  15. 124
  16. 142
  17. 78
  18. 196
  19. 122
  20. 56
  21. 17
  22. 18
  23. 20
  24. 69
  25. 36
  26. 88
  27. 88
  28. 104
  29. 62
  30. 110
  31. 64
  32. 128
  33. 95
  34. 66
  35. 58
  36. 108
  37. 57
  38. 71
  39. 37
  40. 132

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