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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 848 · 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 55 =
  2. 2.Half of 168 =
  3. 3.Double 58 =
  4. 4.Half of 172 =
  5. 5.Double 57 =
  6. 6.Double 76 =
  7. 7.Half of 178 =
  8. 8.Half of 152 =
  9. 9.Double 27 =
  10. 10.Half of 186 =
  11. 11.Double 98 =
  12. 12.Double 29 =
  13. 13.Half of 126 =
  14. 14.Double 51 =
  15. 15.Double 73 =
  16. 16.Double 36 =
  17. 17.Double 65 =
  18. 18.Half of 90 =
  19. 19.Double 92 =
  20. 20.Double 43 =
  21. 21.Double 23 =
  22. 22.Half of 128 =
  23. 23.Half of 164 =
  24. 24.Half of 40 =
  25. 25.Double 84 =
  26. 26.Half of 94 =
  27. 27.Double 93 =
  28. 28.Half of 104 =
  29. 29.Double 64 =
  30. 30.Half of 176 =
  31. 31.Double 69 =
  32. 32.Double 53 =
  33. 33.Half of 84 =
  34. 34.Double 81 =
  35. 35.Double 83 =
  36. 36.Half of 144 =
  37. 37.Half of 120 =
  38. 38.Double 75 =
  39. 39.Double 72 =
  40. 40.Half of 184 =

Answer key

  1. 110
  2. 84
  3. 116
  4. 86
  5. 114
  6. 152
  7. 89
  8. 76
  9. 54
  10. 93
  11. 196
  12. 58
  13. 63
  14. 102
  15. 146
  16. 72
  17. 130
  18. 45
  19. 184
  20. 86
  21. 46
  22. 64
  23. 82
  24. 20
  25. 168
  26. 47
  27. 186
  28. 52
  29. 128
  30. 88
  31. 138
  32. 106
  33. 42
  34. 162
  35. 166
  36. 72
  37. 60
  38. 150
  39. 144
  40. 92

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