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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 936 · 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 92 =
  2. 2.Double 54 =
  3. 3.Half of 120 =
  4. 4.Half of 118 =
  5. 5.Half of 110 =
  6. 6.Double 86 =
  7. 7.Double 85 =
  8. 8.Half of 126 =
  9. 9.Half of 176 =
  10. 10.Half of 182 =
  11. 11.Double 64 =
  12. 12.Double 97 =
  13. 13.Double 99 =
  14. 14.Double 36 =
  15. 15.Double 51 =
  16. 16.Double 65 =
  17. 17.Half of 64 =
  18. 18.Double 93 =
  19. 19.Half of 116 =
  20. 20.Half of 100 =
  21. 21.Double 74 =
  22. 22.Half of 84 =
  23. 23.Double 22 =
  24. 24.Half of 184 =
  25. 25.Double 39 =
  26. 26.Double 58 =
  27. 27.Double 62 =
  28. 28.Double 26 =
  29. 29.Double 57 =
  30. 30.Half of 58 =
  31. 31.Half of 52 =
  32. 32.Half of 72 =
  33. 33.Half of 68 =
  34. 34.Half of 150 =
  35. 35.Double 48 =
  36. 36.Half of 180 =
  37. 37.Double 21 =
  38. 38.Half of 30 =
  39. 39.Half of 188 =
  40. 40.Half of 26 =

Answer key

  1. 46
  2. 108
  3. 60
  4. 59
  5. 55
  6. 172
  7. 170
  8. 63
  9. 88
  10. 91
  11. 128
  12. 194
  13. 198
  14. 72
  15. 102
  16. 130
  17. 32
  18. 186
  19. 58
  20. 50
  21. 148
  22. 42
  23. 44
  24. 92
  25. 78
  26. 116
  27. 124
  28. 52
  29. 114
  30. 29
  31. 26
  32. 36
  33. 34
  34. 75
  35. 96
  36. 90
  37. 42
  38. 15
  39. 94
  40. 13

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