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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 447 · 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. 1.51² =
  2. 2.51² =
  3. 3.31² =
  4. 4.51² =
  5. 5.49² =
  6. 6.31² =
  7. 7.41² =
  8. 8.89² =
  9. 9.91² =
  10. 10.71² =
  11. 11.59² =
  12. 12.89² =
  13. 13.31² =
  14. 14.61² =
  15. 15.91² =
  16. 16.91² =
  17. 17.51² =
  18. 18.21² =
  19. 19.19² =
  20. 20.81² =
  21. 21.29² =
  22. 22.91² =
  23. 23.59² =
  24. 24.71² =
  25. 25.91² =
  26. 26.51² =
  27. 27.21² =
  28. 28.29² =
  29. 29.61² =
  30. 30.39² =
  31. 31.29² =
  32. 32.39² =
  33. 33.59² =
  34. 34.69² =
  35. 35.59² =
  36. 36.89² =
  37. 37.79² =
  38. 38.19² =
  39. 39.91² =
  40. 40.51² =

Answer key

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

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