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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 261 · 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. 1.81² =
  2. 2.89² =
  3. 3.21² =
  4. 4.71² =
  5. 5.49² =
  6. 6.39² =
  7. 7.69² =
  8. 8.49² =
  9. 9.91² =
  10. 10.81² =
  11. 11.19² =
  12. 12.29² =
  13. 13.21² =
  14. 14.49² =
  15. 15.29² =
  16. 16.49² =
  17. 17.61² =
  18. 18.79² =
  19. 19.31² =
  20. 20.41² =
  21. 21.29² =
  22. 22.49² =
  23. 23.21² =
  24. 24.81² =
  25. 25.19² =
  26. 26.21² =
  27. 27.79² =
  28. 28.89² =
  29. 29.71² =
  30. 30.89² =
  31. 31.49² =
  32. 32.39² =
  33. 33.19² =
  34. 34.89² =
  35. 35.79² =
  36. 36.19² =
  37. 37.39² =
  38. 38.41² =
  39. 39.41² =
  40. 40.41² =

Answer key

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

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