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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 558 · 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. 1.31² =
  2. 2.71² =
  3. 3.61² =
  4. 4.51² =
  5. 5.29² =
  6. 6.71² =
  7. 7.31² =
  8. 8.39² =
  9. 9.51² =
  10. 10.91² =
  11. 11.21² =
  12. 12.49² =
  13. 13.89² =
  14. 14.29² =
  15. 15.29² =
  16. 16.21² =
  17. 17.91² =
  18. 18.49² =
  19. 19.61² =
  20. 20.29² =
  21. 21.71² =
  22. 22.31² =
  23. 23.79² =
  24. 24.39² =
  25. 25.71² =
  26. 26.39² =
  27. 27.31² =
  28. 28.31² =
  29. 29.31² =
  30. 30.59² =
  31. 31.19² =
  32. 32.49² =
  33. 33.61² =
  34. 34.71² =
  35. 35.21² =
  36. 36.59² =
  37. 37.19² =
  38. 38.41² =
  39. 39.81² =
  40. 40.71² =

Answer key

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

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