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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 841 · 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 73 =
  2. 2.Double 21 =
  3. 3.Double 22 =
  4. 4.Half of 86 =
  5. 5.Half of 42 =
  6. 6.Half of 38 =
  7. 7.Half of 176 =
  8. 8.Double 16 =
  9. 9.Double 41 =
  10. 10.Double 84 =
  11. 11.Double 54 =
  12. 12.Double 18 =
  13. 13.Half of 142 =
  14. 14.Double 96 =
  15. 15.Double 19 =
  16. 16.Double 31 =
  17. 17.Double 95 =
  18. 18.Half of 166 =
  19. 19.Half of 160 =
  20. 20.Half of 154 =
  21. 21.Half of 198 =
  22. 22.Half of 44 =
  23. 23.Double 28 =
  24. 24.Half of 70 =
  25. 25.Half of 146 =
  26. 26.Double 32 =
  27. 27.Double 91 =
  28. 28.Double 24 =
  29. 29.Half of 26 =
  30. 30.Half of 148 =
  31. 31.Half of 104 =
  32. 32.Half of 48 =
  33. 33.Double 17 =
  34. 34.Double 63 =
  35. 35.Half of 182 =
  36. 36.Half of 92 =
  37. 37.Half of 40 =
  38. 38.Double 46 =
  39. 39.Half of 138 =
  40. 40.Half of 72 =

Answer key

  1. 146
  2. 42
  3. 44
  4. 43
  5. 21
  6. 19
  7. 88
  8. 32
  9. 82
  10. 168
  11. 108
  12. 36
  13. 71
  14. 192
  15. 38
  16. 62
  17. 190
  18. 83
  19. 80
  20. 77
  21. 99
  22. 22
  23. 56
  24. 35
  25. 73
  26. 64
  27. 182
  28. 48
  29. 13
  30. 74
  31. 52
  32. 24
  33. 34
  34. 126
  35. 91
  36. 46
  37. 20
  38. 92
  39. 69
  40. 36

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