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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 907 · 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 63 =
  2. 2.Double 57 =
  3. 3.Double 79 =
  4. 4.Double 34 =
  5. 5.Double 31 =
  6. 6.Double 22 =
  7. 7.Double 52 =
  8. 8.Double 55 =
  9. 9.Double 74 =
  10. 10.Half of 40 =
  11. 11.Half of 168 =
  12. 12.Double 49 =
  13. 13.Double 29 =
  14. 14.Half of 148 =
  15. 15.Half of 184 =
  16. 16.Double 85 =
  17. 17.Half of 90 =
  18. 18.Half of 64 =
  19. 19.Double 26 =
  20. 20.Double 86 =
  21. 21.Half of 48 =
  22. 22.Double 61 =
  23. 23.Half of 68 =
  24. 24.Half of 140 =
  25. 25.Double 76 =
  26. 26.Double 32 =
  27. 27.Double 36 =
  28. 28.Half of 70 =
  29. 29.Double 27 =
  30. 30.Half of 196 =
  31. 31.Double 73 =
  32. 32.Double 19 =
  33. 33.Half of 52 =
  34. 34.Half of 104 =
  35. 35.Double 64 =
  36. 36.Half of 110 =
  37. 37.Double 99 =
  38. 38.Half of 32 =
  39. 39.Half of 120 =
  40. 40.Double 45 =

Answer key

  1. 126
  2. 114
  3. 158
  4. 68
  5. 62
  6. 44
  7. 104
  8. 110
  9. 148
  10. 20
  11. 84
  12. 98
  13. 58
  14. 74
  15. 92
  16. 170
  17. 45
  18. 32
  19. 52
  20. 172
  21. 24
  22. 122
  23. 34
  24. 70
  25. 152
  26. 64
  27. 72
  28. 35
  29. 54
  30. 98
  31. 146
  32. 38
  33. 26
  34. 52
  35. 128
  36. 55
  37. 198
  38. 16
  39. 60
  40. 90

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