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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 696 · 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. 2.21² =
  3. 3.69² =
  4. 4.29² =
  5. 5.59² =
  6. 6.39² =
  7. 7.29² =
  8. 8.19² =
  9. 9.89² =
  10. 10.39² =
  11. 11.39² =
  12. 12.89² =
  13. 13.59² =
  14. 14.59² =
  15. 15.19² =
  16. 16.89² =
  17. 17.51² =
  18. 18.51² =
  19. 19.71² =
  20. 20.69² =
  21. 21.79² =
  22. 22.59² =
  23. 23.21² =
  24. 24.49² =
  25. 25.91² =
  26. 26.31² =
  27. 27.89² =
  28. 28.39² =
  29. 29.91² =
  30. 30.69² =
  31. 31.31² =
  32. 32.31² =
  33. 33.61² =
  34. 34.69² =
  35. 35.31² =
  36. 36.61² =
  37. 37.49² =
  38. 38.41² =
  39. 39.49² =
  40. 40.31² =

Answer key

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

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