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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 920 · 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.Half of 180 =
  2. 2.Double 18 =
  3. 3.Half of 194 =
  4. 4.Double 91 =
  5. 5.Half of 140 =
  6. 6.Double 53 =
  7. 7.Half of 120 =
  8. 8.Half of 62 =
  9. 9.Double 45 =
  10. 10.Half of 142 =
  11. 11.Half of 56 =
  12. 12.Double 35 =
  13. 13.Half of 128 =
  14. 14.Half of 100 =
  15. 15.Half of 80 =
  16. 16.Half of 88 =
  17. 17.Half of 58 =
  18. 18.Half of 132 =
  19. 19.Double 56 =
  20. 20.Double 28 =
  21. 21.Double 86 =
  22. 22.Half of 70 =
  23. 23.Half of 50 =
  24. 24.Half of 150 =
  25. 25.Double 37 =
  26. 26.Half of 186 =
  27. 27.Half of 176 =
  28. 28.Double 29 =
  29. 29.Double 73 =
  30. 30.Double 31 =
  31. 31.Half of 102 =
  32. 32.Double 55 =
  33. 33.Half of 192 =
  34. 34.Half of 118 =
  35. 35.Half of 136 =
  36. 36.Double 71 =
  37. 37.Double 32 =
  38. 38.Double 93 =
  39. 39.Half of 196 =
  40. 40.Double 33 =

Answer key

  1. 90
  2. 36
  3. 97
  4. 182
  5. 70
  6. 106
  7. 60
  8. 31
  9. 90
  10. 71
  11. 28
  12. 70
  13. 64
  14. 50
  15. 40
  16. 44
  17. 29
  18. 66
  19. 112
  20. 56
  21. 172
  22. 35
  23. 25
  24. 75
  25. 74
  26. 93
  27. 88
  28. 58
  29. 146
  30. 62
  31. 51
  32. 110
  33. 96
  34. 59
  35. 68
  36. 142
  37. 64
  38. 186
  39. 98
  40. 66

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