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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 578 · 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. 1.49² =
  2. 2.41² =
  3. 3.39² =
  4. 4.69² =
  5. 5.79² =
  6. 6.69² =
  7. 7.89² =
  8. 8.91² =
  9. 9.41² =
  10. 10.19² =
  11. 11.89² =
  12. 12.59² =
  13. 13.21² =
  14. 14.39² =
  15. 15.81² =
  16. 16.61² =
  17. 17.21² =
  18. 18.69² =
  19. 19.21² =
  20. 20.41² =
  21. 21.19² =
  22. 22.89² =
  23. 23.79² =
  24. 24.69² =
  25. 25.81² =
  26. 26.79² =
  27. 27.81² =
  28. 28.49² =
  29. 29.31² =
  30. 30.69² =
  31. 31.39² =
  32. 32.89² =
  33. 33.59² =
  34. 34.39² =
  35. 35.59² =
  36. 36.39² =
  37. 37.41² =
  38. 38.19² =
  39. 39.71² =
  40. 40.29² =

Answer key

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

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