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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 926 · 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 91 =
  2. 2.Double 64 =
  3. 3.Double 34 =
  4. 4.Double 31 =
  5. 5.Double 88 =
  6. 6.Half of 158 =
  7. 7.Double 53 =
  8. 8.Double 72 =
  9. 9.Half of 46 =
  10. 10.Half of 122 =
  11. 11.Double 48 =
  12. 12.Half of 90 =
  13. 13.Double 17 =
  14. 14.Double 23 =
  15. 15.Double 41 =
  16. 16.Double 19 =
  17. 17.Double 36 =
  18. 18.Half of 50 =
  19. 19.Double 89 =
  20. 20.Half of 98 =
  21. 21.Half of 26 =
  22. 22.Double 24 =
  23. 23.Double 22 =
  24. 24.Half of 62 =
  25. 25.Double 76 =
  26. 26.Double 28 =
  27. 27.Double 74 =
  28. 28.Double 86 =
  29. 29.Half of 154 =
  30. 30.Double 39 =
  31. 31.Double 82 =
  32. 32.Double 94 =
  33. 33.Half of 116 =
  34. 34.Double 95 =
  35. 35.Double 65 =
  36. 36.Half of 194 =
  37. 37.Half of 54 =
  38. 38.Double 42 =
  39. 39.Half of 94 =
  40. 40.Double 51 =

Answer key

  1. 182
  2. 128
  3. 68
  4. 62
  5. 176
  6. 79
  7. 106
  8. 144
  9. 23
  10. 61
  11. 96
  12. 45
  13. 34
  14. 46
  15. 82
  16. 38
  17. 72
  18. 25
  19. 178
  20. 49
  21. 13
  22. 48
  23. 44
  24. 31
  25. 152
  26. 56
  27. 148
  28. 172
  29. 77
  30. 78
  31. 164
  32. 188
  33. 58
  34. 190
  35. 130
  36. 97
  37. 27
  38. 84
  39. 47
  40. 102

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