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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 929 · 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 88 =
  2. 2.Double 93 =
  3. 3.Half of 98 =
  4. 4.Double 48 =
  5. 5.Half of 156 =
  6. 6.Double 45 =
  7. 7.Double 56 =
  8. 8.Double 81 =
  9. 9.Double 65 =
  10. 10.Half of 38 =
  11. 11.Double 86 =
  12. 12.Half of 92 =
  13. 13.Double 78 =
  14. 14.Double 51 =
  15. 15.Double 41 =
  16. 16.Double 23 =
  17. 17.Half of 130 =
  18. 18.Half of 64 =
  19. 19.Double 67 =
  20. 20.Half of 196 =
  21. 21.Double 29 =
  22. 22.Half of 30 =
  23. 23.Double 63 =
  24. 24.Half of 198 =
  25. 25.Double 76 =
  26. 26.Half of 150 =
  27. 27.Half of 186 =
  28. 28.Half of 96 =
  29. 29.Double 27 =
  30. 30.Half of 46 =
  31. 31.Half of 146 =
  32. 32.Half of 168 =
  33. 33.Half of 192 =
  34. 34.Double 16 =
  35. 35.Double 49 =
  36. 36.Double 61 =
  37. 37.Double 97 =
  38. 38.Double 39 =
  39. 39.Double 26 =
  40. 40.Half of 84 =

Answer key

  1. 44
  2. 186
  3. 49
  4. 96
  5. 78
  6. 90
  7. 112
  8. 162
  9. 130
  10. 19
  11. 172
  12. 46
  13. 156
  14. 102
  15. 82
  16. 46
  17. 65
  18. 32
  19. 134
  20. 98
  21. 58
  22. 15
  23. 126
  24. 99
  25. 152
  26. 75
  27. 93
  28. 48
  29. 54
  30. 23
  31. 73
  32. 84
  33. 96
  34. 32
  35. 98
  36. 122
  37. 194
  38. 78
  39. 52
  40. 42

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