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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 425 · 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. 2.69² =
  3. 3.29² =
  4. 4.59² =
  5. 5.51² =
  6. 6.59² =
  7. 7.29² =
  8. 8.91² =
  9. 9.69² =
  10. 10.19² =
  11. 11.41² =
  12. 12.79² =
  13. 13.39² =
  14. 14.59² =
  15. 15.61² =
  16. 16.51² =
  17. 17.69² =
  18. 18.19² =
  19. 19.31² =
  20. 20.61² =
  21. 21.29² =
  22. 22.71² =
  23. 23.61² =
  24. 24.19² =
  25. 25.59² =
  26. 26.39² =
  27. 27.71² =
  28. 28.39² =
  29. 29.21² =
  30. 30.41² =
  31. 31.81² =
  32. 32.41² =
  33. 33.61² =
  34. 34.71² =
  35. 35.39² =
  36. 36.21² =
  37. 37.41² =
  38. 38.79² =
  39. 39.39² =
  40. 40.29² =

Answer key

  1. 2401
  2. 4761
  3. 841
  4. 3481
  5. 2601
  6. 3481
  7. 841
  8. 8281
  9. 4761
  10. 361
  11. 1681
  12. 6241
  13. 1521
  14. 3481
  15. 3721
  16. 2601
  17. 4761
  18. 361
  19. 961
  20. 3721
  21. 841
  22. 5041
  23. 3721
  24. 361
  25. 3481
  26. 1521
  27. 5041
  28. 1521
  29. 441
  30. 1681
  31. 6561
  32. 1681
  33. 3721
  34. 5041
  35. 1521
  36. 441
  37. 1681
  38. 6241
  39. 1521
  40. 841

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