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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 981 · 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 58 =
  2. 2.Double 18 =
  3. 3.Half of 86 =
  4. 4.Half of 104 =
  5. 5.Double 32 =
  6. 6.Double 37 =
  7. 7.Double 63 =
  8. 8.Half of 178 =
  9. 9.Double 34 =
  10. 10.Half of 44 =
  11. 11.Double 42 =
  12. 12.Half of 164 =
  13. 13.Double 53 =
  14. 14.Half of 66 =
  15. 15.Double 95 =
  16. 16.Half of 68 =
  17. 17.Double 83 =
  18. 18.Double 72 =
  19. 19.Half of 64 =
  20. 20.Half of 82 =
  21. 21.Double 94 =
  22. 22.Half of 168 =
  23. 23.Half of 126 =
  24. 24.Half of 110 =
  25. 25.Double 25 =
  26. 26.Half of 198 =
  27. 27.Half of 100 =
  28. 28.Double 71 =
  29. 29.Half of 144 =
  30. 30.Half of 152 =
  31. 31.Half of 90 =
  32. 32.Half of 154 =
  33. 33.Half of 172 =
  34. 34.Half of 34 =
  35. 35.Double 62 =
  36. 36.Double 21 =
  37. 37.Double 91 =
  38. 38.Half of 32 =
  39. 39.Double 31 =
  40. 40.Double 64 =

Answer key

  1. 116
  2. 36
  3. 43
  4. 52
  5. 64
  6. 74
  7. 126
  8. 89
  9. 68
  10. 22
  11. 84
  12. 82
  13. 106
  14. 33
  15. 190
  16. 34
  17. 166
  18. 144
  19. 32
  20. 41
  21. 188
  22. 84
  23. 63
  24. 55
  25. 50
  26. 99
  27. 50
  28. 142
  29. 72
  30. 76
  31. 45
  32. 77
  33. 86
  34. 17
  35. 124
  36. 42
  37. 182
  38. 16
  39. 62
  40. 128

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