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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 722 · 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. 1.41² =
  2. 2.49² =
  3. 3.51² =
  4. 4.21² =
  5. 5.29² =
  6. 6.39² =
  7. 7.51² =
  8. 8.39² =
  9. 9.21² =
  10. 10.41² =
  11. 11.81² =
  12. 12.59² =
  13. 13.59² =
  14. 14.91² =
  15. 15.31² =
  16. 16.39² =
  17. 17.79² =
  18. 18.69² =
  19. 19.59² =
  20. 20.59² =
  21. 21.81² =
  22. 22.71² =
  23. 23.19² =
  24. 24.41² =
  25. 25.89² =
  26. 26.51² =
  27. 27.89² =
  28. 28.59² =
  29. 29.81² =
  30. 30.61² =
  31. 31.49² =
  32. 32.39² =
  33. 33.71² =
  34. 34.49² =
  35. 35.31² =
  36. 36.61² =
  37. 37.91² =
  38. 38.39² =
  39. 39.69² =
  40. 40.71² =

Answer key

  1. 1681
  2. 2401
  3. 2601
  4. 441
  5. 841
  6. 1521
  7. 2601
  8. 1521
  9. 441
  10. 1681
  11. 6561
  12. 3481
  13. 3481
  14. 8281
  15. 961
  16. 1521
  17. 6241
  18. 4761
  19. 3481
  20. 3481
  21. 6561
  22. 5041
  23. 361
  24. 1681
  25. 7921
  26. 2601
  27. 7921
  28. 3481
  29. 6561
  30. 3721
  31. 2401
  32. 1521
  33. 5041
  34. 2401
  35. 961
  36. 3721
  37. 8281
  38. 1521
  39. 4761
  40. 5041

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