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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 350 · 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. 1.21² =
  2. 2.49² =
  3. 3.41² =
  4. 4.29² =
  5. 5.81² =
  6. 6.19² =
  7. 7.31² =
  8. 8.79² =
  9. 9.81² =
  10. 10.61² =
  11. 11.59² =
  12. 12.41² =
  13. 13.31² =
  14. 14.31² =
  15. 15.19² =
  16. 16.59² =
  17. 17.49² =
  18. 18.29² =
  19. 19.71² =
  20. 20.19² =
  21. 21.19² =
  22. 22.41² =
  23. 23.19² =
  24. 24.49² =
  25. 25.71² =
  26. 26.39² =
  27. 27.31² =
  28. 28.69² =
  29. 29.89² =
  30. 30.31² =
  31. 31.49² =
  32. 32.59² =
  33. 33.81² =
  34. 34.59² =
  35. 35.41² =
  36. 36.21² =
  37. 37.21² =
  38. 38.49² =
  39. 39.69² =
  40. 40.91² =

Answer key

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

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