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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 611 · 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. 1.59² =
  2. 2.39² =
  3. 3.39² =
  4. 4.49² =
  5. 5.79² =
  6. 6.69² =
  7. 7.39² =
  8. 8.61² =
  9. 9.89² =
  10. 10.59² =
  11. 11.31² =
  12. 12.29² =
  13. 13.69² =
  14. 14.19² =
  15. 15.51² =
  16. 16.31² =
  17. 17.29² =
  18. 18.51² =
  19. 19.59² =
  20. 20.81² =
  21. 21.79² =
  22. 22.39² =
  23. 23.49² =
  24. 24.59² =
  25. 25.79² =
  26. 26.91² =
  27. 27.89² =
  28. 28.19² =
  29. 29.59² =
  30. 30.41² =
  31. 31.21² =
  32. 32.29² =
  33. 33.79² =
  34. 34.41² =
  35. 35.39² =
  36. 36.59² =
  37. 37.89² =
  38. 38.71² =
  39. 39.69² =
  40. 40.89² =

Answer key

  1. 3481
  2. 1521
  3. 1521
  4. 2401
  5. 6241
  6. 4761
  7. 1521
  8. 3721
  9. 7921
  10. 3481
  11. 961
  12. 841
  13. 4761
  14. 361
  15. 2601
  16. 961
  17. 841
  18. 2601
  19. 3481
  20. 6561
  21. 6241
  22. 1521
  23. 2401
  24. 3481
  25. 6241
  26. 8281
  27. 7921
  28. 361
  29. 3481
  30. 1681
  31. 441
  32. 841
  33. 6241
  34. 1681
  35. 1521
  36. 3481
  37. 7921
  38. 5041
  39. 4761
  40. 7921

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