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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 407 · 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. 2.79² =
  3. 3.21² =
  4. 4.49² =
  5. 5.89² =
  6. 6.69² =
  7. 7.39² =
  8. 8.79² =
  9. 9.39² =
  10. 10.69² =
  11. 11.31² =
  12. 12.19² =
  13. 13.89² =
  14. 14.69² =
  15. 15.39² =
  16. 16.21² =
  17. 17.71² =
  18. 18.21² =
  19. 19.81² =
  20. 20.71² =
  21. 21.31² =
  22. 22.69² =
  23. 23.81² =
  24. 24.69² =
  25. 25.81² =
  26. 26.91² =
  27. 27.31² =
  28. 28.41² =
  29. 29.29² =
  30. 30.71² =
  31. 31.59² =
  32. 32.49² =
  33. 33.51² =
  34. 34.89² =
  35. 35.19² =
  36. 36.71² =
  37. 37.39² =
  38. 38.69² =
  39. 39.41² =
  40. 40.79² =

Answer key

  1. 961
  2. 6241
  3. 441
  4. 2401
  5. 7921
  6. 4761
  7. 1521
  8. 6241
  9. 1521
  10. 4761
  11. 961
  12. 361
  13. 7921
  14. 4761
  15. 1521
  16. 441
  17. 5041
  18. 441
  19. 6561
  20. 5041
  21. 961
  22. 4761
  23. 6561
  24. 4761
  25. 6561
  26. 8281
  27. 961
  28. 1681
  29. 841
  30. 5041
  31. 3481
  32. 2401
  33. 2601
  34. 7921
  35. 361
  36. 5041
  37. 1521
  38. 4761
  39. 1681
  40. 6241

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