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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 768 · 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. 2.29² =
  3. 3.29² =
  4. 4.41² =
  5. 5.79² =
  6. 6.29² =
  7. 7.59² =
  8. 8.91² =
  9. 9.31² =
  10. 10.49² =
  11. 11.59² =
  12. 12.51² =
  13. 13.59² =
  14. 14.39² =
  15. 15.91² =
  16. 16.91² =
  17. 17.61² =
  18. 18.61² =
  19. 19.51² =
  20. 20.19² =
  21. 21.39² =
  22. 22.31² =
  23. 23.39² =
  24. 24.51² =
  25. 25.29² =
  26. 26.29² =
  27. 27.89² =
  28. 28.91² =
  29. 29.79² =
  30. 30.71² =
  31. 31.29² =
  32. 32.21² =
  33. 33.81² =
  34. 34.31² =
  35. 35.41² =
  36. 36.69² =
  37. 37.59² =
  38. 38.61² =
  39. 39.29² =
  40. 40.21² =

Answer key

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

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