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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 944 · 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 42 =
  2. 2.Double 31 =
  3. 3.Double 56 =
  4. 4.Double 36 =
  5. 5.Double 45 =
  6. 6.Double 72 =
  7. 7.Half of 52 =
  8. 8.Double 79 =
  9. 9.Double 64 =
  10. 10.Double 97 =
  11. 11.Double 33 =
  12. 12.Half of 74 =
  13. 13.Half of 90 =
  14. 14.Double 35 =
  15. 15.Double 22 =
  16. 16.Half of 172 =
  17. 17.Half of 184 =
  18. 18.Double 73 =
  19. 19.Double 76 =
  20. 20.Half of 28 =
  21. 21.Half of 32 =
  22. 22.Half of 68 =
  23. 23.Double 34 =
  24. 24.Half of 140 =
  25. 25.Double 61 =
  26. 26.Double 74 =
  27. 27.Double 21 =
  28. 28.Half of 56 =
  29. 29.Double 95 =
  30. 30.Half of 128 =
  31. 31.Double 26 =
  32. 32.Double 89 =
  33. 33.Half of 50 =
  34. 34.Double 63 =
  35. 35.Double 65 =
  36. 36.Half of 190 =
  37. 37.Half of 162 =
  38. 38.Half of 116 =
  39. 39.Double 28 =
  40. 40.Double 71 =

Answer key

  1. 21
  2. 62
  3. 112
  4. 72
  5. 90
  6. 144
  7. 26
  8. 158
  9. 128
  10. 194
  11. 66
  12. 37
  13. 45
  14. 70
  15. 44
  16. 86
  17. 92
  18. 146
  19. 152
  20. 14
  21. 16
  22. 34
  23. 68
  24. 70
  25. 122
  26. 148
  27. 42
  28. 28
  29. 190
  30. 64
  31. 52
  32. 178
  33. 25
  34. 126
  35. 130
  36. 95
  37. 81
  38. 58
  39. 56
  40. 142

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