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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 376 · 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. 1.39² =
  2. 2.79² =
  3. 3.39² =
  4. 4.19² =
  5. 5.19² =
  6. 6.79² =
  7. 7.61² =
  8. 8.71² =
  9. 9.29² =
  10. 10.41² =
  11. 11.49² =
  12. 12.81² =
  13. 13.31² =
  14. 14.89² =
  15. 15.79² =
  16. 16.59² =
  17. 17.19² =
  18. 18.41² =
  19. 19.29² =
  20. 20.31² =
  21. 21.61² =
  22. 22.29² =
  23. 23.21² =
  24. 24.19² =
  25. 25.89² =
  26. 26.89² =
  27. 27.69² =
  28. 28.31² =
  29. 29.81² =
  30. 30.59² =
  31. 31.61² =
  32. 32.29² =
  33. 33.39² =
  34. 34.41² =
  35. 35.91² =
  36. 36.89² =
  37. 37.49² =
  38. 38.21² =
  39. 39.39² =
  40. 40.41² =

Answer key

  1. 1521
  2. 6241
  3. 1521
  4. 361
  5. 361
  6. 6241
  7. 3721
  8. 5041
  9. 841
  10. 1681
  11. 2401
  12. 6561
  13. 961
  14. 7921
  15. 6241
  16. 3481
  17. 361
  18. 1681
  19. 841
  20. 961
  21. 3721
  22. 841
  23. 441
  24. 361
  25. 7921
  26. 7921
  27. 4761
  28. 961
  29. 6561
  30. 3481
  31. 3721
  32. 841
  33. 1521
  34. 1681
  35. 8281
  36. 7921
  37. 2401
  38. 441
  39. 1521
  40. 1681

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