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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 673 · 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. 1.21² =
  2. 2.41² =
  3. 3.49² =
  4. 4.89² =
  5. 5.59² =
  6. 6.39² =
  7. 7.31² =
  8. 8.21² =
  9. 9.71² =
  10. 10.39² =
  11. 11.59² =
  12. 12.19² =
  13. 13.21² =
  14. 14.29² =
  15. 15.39² =
  16. 16.81² =
  17. 17.19² =
  18. 18.41² =
  19. 19.59² =
  20. 20.19² =
  21. 21.49² =
  22. 22.71² =
  23. 23.71² =
  24. 24.21² =
  25. 25.71² =
  26. 26.71² =
  27. 27.41² =
  28. 28.59² =
  29. 29.51² =
  30. 30.31² =
  31. 31.61² =
  32. 32.39² =
  33. 33.29² =
  34. 34.61² =
  35. 35.49² =
  36. 36.49² =
  37. 37.49² =
  38. 38.69² =
  39. 39.81² =
  40. 40.19² =

Answer key

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

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