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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 999 · 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 26 =
  2. 2.Half of 152 =
  3. 3.Half of 28 =
  4. 4.Half of 176 =
  5. 5.Half of 142 =
  6. 6.Double 56 =
  7. 7.Half of 62 =
  8. 8.Double 39 =
  9. 9.Half of 196 =
  10. 10.Half of 50 =
  11. 11.Half of 124 =
  12. 12.Double 65 =
  13. 13.Half of 148 =
  14. 14.Double 28 =
  15. 15.Half of 52 =
  16. 16.Double 86 =
  17. 17.Half of 168 =
  18. 18.Half of 48 =
  19. 19.Double 89 =
  20. 20.Double 31 =
  21. 21.Half of 68 =
  22. 22.Double 17 =
  23. 23.Double 78 =
  24. 24.Double 92 =
  25. 25.Half of 40 =
  26. 26.Half of 70 =
  27. 27.Half of 94 =
  28. 28.Half of 140 =
  29. 29.Double 91 =
  30. 30.Double 25 =
  31. 31.Half of 86 =
  32. 32.Half of 166 =
  33. 33.Double 22 =
  34. 34.Half of 172 =
  35. 35.Half of 164 =
  36. 36.Double 67 =
  37. 37.Double 85 =
  38. 38.Double 63 =
  39. 39.Double 41 =
  40. 40.Half of 66 =

Answer key

  1. 13
  2. 76
  3. 14
  4. 88
  5. 71
  6. 112
  7. 31
  8. 78
  9. 98
  10. 25
  11. 62
  12. 130
  13. 74
  14. 56
  15. 26
  16. 172
  17. 84
  18. 24
  19. 178
  20. 62
  21. 34
  22. 34
  23. 156
  24. 184
  25. 20
  26. 35
  27. 47
  28. 70
  29. 182
  30. 50
  31. 43
  32. 83
  33. 44
  34. 86
  35. 82
  36. 134
  37. 170
  38. 126
  39. 82
  40. 33

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