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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 951 · 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 34 =
  2. 2.Double 84 =
  3. 3.Half of 120 =
  4. 4.Half of 70 =
  5. 5.Double 58 =
  6. 6.Double 35 =
  7. 7.Double 74 =
  8. 8.Half of 126 =
  9. 9.Half of 60 =
  10. 10.Half of 64 =
  11. 11.Double 38 =
  12. 12.Double 27 =
  13. 13.Half of 148 =
  14. 14.Double 71 =
  15. 15.Half of 88 =
  16. 16.Double 41 =
  17. 17.Half of 62 =
  18. 18.Double 26 =
  19. 19.Double 73 =
  20. 20.Half of 72 =
  21. 21.Half of 44 =
  22. 22.Double 56 =
  23. 23.Half of 90 =
  24. 24.Half of 82 =
  25. 25.Double 16 =
  26. 26.Half of 32 =
  27. 27.Half of 30 =
  28. 28.Double 47 =
  29. 29.Double 17 =
  30. 30.Double 37 =
  31. 31.Double 24 =
  32. 32.Half of 198 =
  33. 33.Double 72 =
  34. 34.Half of 128 =
  35. 35.Half of 146 =
  36. 36.Half of 52 =
  37. 37.Half of 188 =
  38. 38.Double 57 =
  39. 39.Half of 174 =
  40. 40.Double 67 =

Answer key

  1. 68
  2. 168
  3. 60
  4. 35
  5. 116
  6. 70
  7. 148
  8. 63
  9. 30
  10. 32
  11. 76
  12. 54
  13. 74
  14. 142
  15. 44
  16. 82
  17. 31
  18. 52
  19. 146
  20. 36
  21. 22
  22. 112
  23. 45
  24. 41
  25. 32
  26. 16
  27. 15
  28. 94
  29. 34
  30. 74
  31. 48
  32. 99
  33. 144
  34. 64
  35. 73
  36. 26
  37. 94
  38. 114
  39. 87
  40. 134

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