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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 96 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.69² =
  2. 2.19² =
  3. 3.31² =
  4. 4.39² =
  5. 5.21² =
  6. 6.91² =
  7. 7.61² =
  8. 8.31² =
  9. 9.69² =
  10. 10.51² =
  11. 11.41² =
  12. 12.89² =
  13. 13.81² =
  14. 14.29² =
  15. 15.81² =
  16. 16.81² =
  17. 17.41² =
  18. 18.41² =
  19. 19.89² =
  20. 20.19² =
  21. 21.61² =
  22. 22.91² =
  23. 23.61² =
  24. 24.91² =
  25. 25.19² =
  26. 26.91² =
  27. 27.19² =
  28. 28.71² =
  29. 29.41² =
  30. 30.41² =
  31. 31.81² =
  32. 32.69² =
  33. 33.19² =
  34. 34.21² =
  35. 35.61² =
  36. 36.19² =
  37. 37.81² =
  38. 38.61² =
  39. 39.61² =
  40. 40.41² =

Answer key

  1. 4761
  2. 361
  3. 961
  4. 1521
  5. 441
  6. 8281
  7. 3721
  8. 961
  9. 4761
  10. 2601
  11. 1681
  12. 7921
  13. 6561
  14. 841
  15. 6561
  16. 6561
  17. 1681
  18. 1681
  19. 7921
  20. 361
  21. 3721
  22. 8281
  23. 3721
  24. 8281
  25. 361
  26. 8281
  27. 361
  28. 5041
  29. 1681
  30. 1681
  31. 6561
  32. 4761
  33. 361
  34. 441
  35. 3721
  36. 361
  37. 6561
  38. 3721
  39. 3721
  40. 1681

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