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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 983 · 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 86 =
  2. 2.Half of 76 =
  3. 3.Half of 102 =
  4. 4.Double 21 =
  5. 5.Double 44 =
  6. 6.Double 87 =
  7. 7.Double 63 =
  8. 8.Half of 36 =
  9. 9.Half of 184 =
  10. 10.Double 33 =
  11. 11.Double 27 =
  12. 12.Double 31 =
  13. 13.Half of 110 =
  14. 14.Double 34 =
  15. 15.Half of 70 =
  16. 16.Half of 164 =
  17. 17.Double 41 =
  18. 18.Double 82 =
  19. 19.Double 81 =
  20. 20.Double 51 =
  21. 21.Half of 90 =
  22. 22.Half of 188 =
  23. 23.Double 77 =
  24. 24.Double 85 =
  25. 25.Half of 74 =
  26. 26.Double 16 =
  27. 27.Double 35 =
  28. 28.Half of 128 =
  29. 29.Half of 94 =
  30. 30.Half of 172 =
  31. 31.Double 47 =
  32. 32.Half of 142 =
  33. 33.Half of 140 =
  34. 34.Half of 78 =
  35. 35.Double 72 =
  36. 36.Double 38 =
  37. 37.Half of 38 =
  38. 38.Half of 54 =
  39. 39.Double 78 =
  40. 40.Half of 48 =

Answer key

  1. 172
  2. 38
  3. 51
  4. 42
  5. 88
  6. 174
  7. 126
  8. 18
  9. 92
  10. 66
  11. 54
  12. 62
  13. 55
  14. 68
  15. 35
  16. 82
  17. 82
  18. 164
  19. 162
  20. 102
  21. 45
  22. 94
  23. 154
  24. 170
  25. 37
  26. 32
  27. 70
  28. 64
  29. 47
  30. 86
  31. 94
  32. 71
  33. 70
  34. 39
  35. 144
  36. 76
  37. 19
  38. 27
  39. 156
  40. 24

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