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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 879 · 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 81 =
  2. 2.Half of 150 =
  3. 3.Half of 48 =
  4. 4.Half of 194 =
  5. 5.Double 45 =
  6. 6.Half of 34 =
  7. 7.Half of 40 =
  8. 8.Double 37 =
  9. 9.Double 66 =
  10. 10.Half of 198 =
  11. 11.Half of 146 =
  12. 12.Half of 128 =
  13. 13.Half of 124 =
  14. 14.Double 83 =
  15. 15.Half of 144 =
  16. 16.Double 29 =
  17. 17.Double 89 =
  18. 18.Double 41 =
  19. 19.Double 54 =
  20. 20.Double 95 =
  21. 21.Half of 80 =
  22. 22.Half of 56 =
  23. 23.Double 55 =
  24. 24.Double 35 =
  25. 25.Half of 176 =
  26. 26.Double 24 =
  27. 27.Double 71 =
  28. 28.Double 27 =
  29. 29.Half of 30 =
  30. 30.Double 94 =
  31. 31.Double 53 =
  32. 32.Double 59 =
  33. 33.Half of 72 =
  34. 34.Half of 36 =
  35. 35.Double 63 =
  36. 36.Double 39 =
  37. 37.Double 31 =
  38. 38.Half of 98 =
  39. 39.Half of 110 =
  40. 40.Double 77 =

Answer key

  1. 162
  2. 75
  3. 24
  4. 97
  5. 90
  6. 17
  7. 20
  8. 74
  9. 132
  10. 99
  11. 73
  12. 64
  13. 62
  14. 166
  15. 72
  16. 58
  17. 178
  18. 82
  19. 108
  20. 190
  21. 40
  22. 28
  23. 110
  24. 70
  25. 88
  26. 48
  27. 142
  28. 54
  29. 15
  30. 188
  31. 106
  32. 118
  33. 36
  34. 18
  35. 126
  36. 78
  37. 62
  38. 49
  39. 55
  40. 154

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