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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 607 · 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. 2.71² =
  3. 3.61² =
  4. 4.29² =
  5. 5.61² =
  6. 6.21² =
  7. 7.81² =
  8. 8.51² =
  9. 9.61² =
  10. 10.59² =
  11. 11.41² =
  12. 12.39² =
  13. 13.21² =
  14. 14.29² =
  15. 15.89² =
  16. 16.69² =
  17. 17.51² =
  18. 18.19² =
  19. 19.71² =
  20. 20.51² =
  21. 21.31² =
  22. 22.89² =
  23. 23.71² =
  24. 24.79² =
  25. 25.31² =
  26. 26.59² =
  27. 27.21² =
  28. 28.59² =
  29. 29.61² =
  30. 30.91² =
  31. 31.61² =
  32. 32.39² =
  33. 33.29² =
  34. 34.79² =
  35. 35.69² =
  36. 36.91² =
  37. 37.71² =
  38. 38.71² =
  39. 39.89² =
  40. 40.49² =

Answer key

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

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