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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 871 · 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 21 =
  2. 2.Half of 98 =
  3. 3.Double 62 =
  4. 4.Half of 104 =
  5. 5.Half of 68 =
  6. 6.Half of 78 =
  7. 7.Half of 116 =
  8. 8.Double 16 =
  9. 9.Double 95 =
  10. 10.Half of 70 =
  11. 11.Half of 142 =
  12. 12.Double 34 =
  13. 13.Half of 94 =
  14. 14.Half of 132 =
  15. 15.Double 57 =
  16. 16.Half of 198 =
  17. 17.Double 19 =
  18. 18.Half of 144 =
  19. 19.Double 49 =
  20. 20.Half of 162 =
  21. 21.Half of 86 =
  22. 22.Half of 34 =
  23. 23.Half of 90 =
  24. 24.Double 99 =
  25. 25.Double 17 =
  26. 26.Double 96 =
  27. 27.Double 72 =
  28. 28.Half of 160 =
  29. 29.Double 98 =
  30. 30.Double 54 =
  31. 31.Half of 82 =
  32. 32.Double 44 =
  33. 33.Half of 26 =
  34. 34.Double 22 =
  35. 35.Half of 32 =
  36. 36.Double 26 =
  37. 37.Half of 76 =
  38. 38.Double 55 =
  39. 39.Half of 128 =
  40. 40.Double 51 =

Answer key

  1. 42
  2. 49
  3. 124
  4. 52
  5. 34
  6. 39
  7. 58
  8. 32
  9. 190
  10. 35
  11. 71
  12. 68
  13. 47
  14. 66
  15. 114
  16. 99
  17. 38
  18. 72
  19. 98
  20. 81
  21. 43
  22. 17
  23. 45
  24. 198
  25. 34
  26. 192
  27. 144
  28. 80
  29. 196
  30. 108
  31. 41
  32. 88
  33. 13
  34. 44
  35. 16
  36. 52
  37. 38
  38. 110
  39. 64
  40. 102

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