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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 979 · 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 21 =
  2. 2.Double 93 =
  3. 3.Double 39 =
  4. 4.Double 87 =
  5. 5.Double 41 =
  6. 6.Double 82 =
  7. 7.Double 57 =
  8. 8.Double 36 =
  9. 9.Half of 150 =
  10. 10.Double 51 =
  11. 11.Half of 178 =
  12. 12.Double 88 =
  13. 13.Half of 72 =
  14. 14.Half of 88 =
  15. 15.Half of 110 =
  16. 16.Double 18 =
  17. 17.Double 69 =
  18. 18.Half of 58 =
  19. 19.Double 34 =
  20. 20.Double 95 =
  21. 21.Double 94 =
  22. 22.Half of 180 =
  23. 23.Half of 162 =
  24. 24.Double 43 =
  25. 25.Double 86 =
  26. 26.Half of 188 =
  27. 27.Half of 84 =
  28. 28.Half of 146 =
  29. 29.Double 96 =
  30. 30.Half of 92 =
  31. 31.Half of 90 =
  32. 32.Double 62 =
  33. 33.Double 81 =
  34. 34.Half of 108 =
  35. 35.Half of 28 =
  36. 36.Double 92 =
  37. 37.Double 44 =
  38. 38.Half of 78 =
  39. 39.Half of 46 =
  40. 40.Half of 196 =

Answer key

  1. 42
  2. 186
  3. 78
  4. 174
  5. 82
  6. 164
  7. 114
  8. 72
  9. 75
  10. 102
  11. 89
  12. 176
  13. 36
  14. 44
  15. 55
  16. 36
  17. 138
  18. 29
  19. 68
  20. 190
  21. 188
  22. 90
  23. 81
  24. 86
  25. 172
  26. 94
  27. 42
  28. 73
  29. 192
  30. 46
  31. 45
  32. 124
  33. 162
  34. 54
  35. 14
  36. 184
  37. 88
  38. 39
  39. 23
  40. 98

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