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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 970 · 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 148 =
  2. 2.Half of 36 =
  3. 3.Double 32 =
  4. 4.Half of 76 =
  5. 5.Double 87 =
  6. 6.Double 64 =
  7. 7.Double 95 =
  8. 8.Double 23 =
  9. 9.Double 56 =
  10. 10.Half of 160 =
  11. 11.Half of 44 =
  12. 12.Half of 168 =
  13. 13.Double 92 =
  14. 14.Half of 82 =
  15. 15.Half of 128 =
  16. 16.Double 29 =
  17. 17.Half of 60 =
  18. 18.Double 27 =
  19. 19.Double 94 =
  20. 20.Half of 192 =
  21. 21.Half of 42 =
  22. 22.Double 31 =
  23. 23.Half of 188 =
  24. 24.Half of 100 =
  25. 25.Double 19 =
  26. 26.Half of 32 =
  27. 27.Double 74 =
  28. 28.Double 71 =
  29. 29.Double 69 =
  30. 30.Double 67 =
  31. 31.Half of 140 =
  32. 32.Double 88 =
  33. 33.Double 49 =
  34. 34.Half of 70 =
  35. 35.Half of 58 =
  36. 36.Half of 164 =
  37. 37.Half of 110 =
  38. 38.Double 86 =
  39. 39.Double 21 =
  40. 40.Double 72 =

Answer key

  1. 74
  2. 18
  3. 64
  4. 38
  5. 174
  6. 128
  7. 190
  8. 46
  9. 112
  10. 80
  11. 22
  12. 84
  13. 184
  14. 41
  15. 64
  16. 58
  17. 30
  18. 54
  19. 188
  20. 96
  21. 21
  22. 62
  23. 94
  24. 50
  25. 38
  26. 16
  27. 148
  28. 142
  29. 138
  30. 134
  31. 70
  32. 176
  33. 98
  34. 35
  35. 29
  36. 82
  37. 55
  38. 172
  39. 42
  40. 144

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