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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 572 · 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. 2.91² =
  3. 3.29² =
  4. 4.81² =
  5. 5.19² =
  6. 6.59² =
  7. 7.31² =
  8. 8.79² =
  9. 9.19² =
  10. 10.59² =
  11. 11.81² =
  12. 12.49² =
  13. 13.29² =
  14. 14.49² =
  15. 15.59² =
  16. 16.39² =
  17. 17.29² =
  18. 18.31² =
  19. 19.31² =
  20. 20.31² =
  21. 21.91² =
  22. 22.81² =
  23. 23.91² =
  24. 24.89² =
  25. 25.71² =
  26. 26.19² =
  27. 27.41² =
  28. 28.19² =
  29. 29.79² =
  30. 30.21² =
  31. 31.21² =
  32. 32.81² =
  33. 33.69² =
  34. 34.89² =
  35. 35.29² =
  36. 36.81² =
  37. 37.71² =
  38. 38.21² =
  39. 39.21² =
  40. 40.31² =

Answer key

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

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