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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 629 · 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. 1.59² =
  2. 2.91² =
  3. 3.51² =
  4. 4.39² =
  5. 5.29² =
  6. 6.21² =
  7. 7.39² =
  8. 8.61² =
  9. 9.61² =
  10. 10.59² =
  11. 11.91² =
  12. 12.29² =
  13. 13.39² =
  14. 14.21² =
  15. 15.91² =
  16. 16.91² =
  17. 17.39² =
  18. 18.79² =
  19. 19.59² =
  20. 20.39² =
  21. 21.71² =
  22. 22.79² =
  23. 23.31² =
  24. 24.59² =
  25. 25.49² =
  26. 26.31² =
  27. 27.29² =
  28. 28.29² =
  29. 29.61² =
  30. 30.41² =
  31. 31.89² =
  32. 32.29² =
  33. 33.31² =
  34. 34.51² =
  35. 35.71² =
  36. 36.81² =
  37. 37.31² =
  38. 38.61² =
  39. 39.91² =
  40. 40.91² =

Answer key

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

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