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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 639 · 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 196 =
  2. 2.Half of 182 =
  3. 3.Double 51 =
  4. 4.Half of 160 =
  5. 5.Half of 44 =
  6. 6.Half of 194 =
  7. 7.Double 61 =
  8. 8.Double 88 =
  9. 9.Double 26 =
  10. 10.Half of 100 =
  11. 11.Half of 74 =
  12. 12.Half of 164 =
  13. 13.Double 22 =
  14. 14.Double 82 =
  15. 15.Double 92 =
  16. 16.Half of 98 =
  17. 17.Double 71 =
  18. 18.Half of 142 =
  19. 19.Double 63 =
  20. 20.Double 65 =
  21. 21.Double 85 =
  22. 22.Double 34 =
  23. 23.Double 19 =
  24. 24.Double 64 =
  25. 25.Half of 134 =
  26. 26.Double 27 =
  27. 27.Double 97 =
  28. 28.Half of 138 =
  29. 29.Half of 146 =
  30. 30.Double 52 =
  31. 31.Double 31 =
  32. 32.Double 91 =
  33. 33.Half of 40 =
  34. 34.Half of 64 =
  35. 35.Half of 38 =
  36. 36.Double 83 =
  37. 37.Double 67 =
  38. 38.Half of 86 =
  39. 39.Double 95 =
  40. 40.Half of 144 =

Answer key

  1. 98
  2. 91
  3. 102
  4. 80
  5. 22
  6. 97
  7. 122
  8. 176
  9. 52
  10. 50
  11. 37
  12. 82
  13. 44
  14. 164
  15. 184
  16. 49
  17. 142
  18. 71
  19. 126
  20. 130
  21. 170
  22. 68
  23. 38
  24. 128
  25. 67
  26. 54
  27. 194
  28. 69
  29. 73
  30. 104
  31. 62
  32. 182
  33. 20
  34. 32
  35. 19
  36. 166
  37. 134
  38. 43
  39. 190
  40. 72

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