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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 779 · 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. 1.51² =
  2. 2.61² =
  3. 3.19² =
  4. 4.59² =
  5. 5.89² =
  6. 6.21² =
  7. 7.79² =
  8. 8.69² =
  9. 9.89² =
  10. 10.31² =
  11. 11.61² =
  12. 12.39² =
  13. 13.41² =
  14. 14.29² =
  15. 15.79² =
  16. 16.49² =
  17. 17.39² =
  18. 18.89² =
  19. 19.61² =
  20. 20.19² =
  21. 21.81² =
  22. 22.21² =
  23. 23.49² =
  24. 24.61² =
  25. 25.51² =
  26. 26.81² =
  27. 27.61² =
  28. 28.89² =
  29. 29.41² =
  30. 30.79² =
  31. 31.29² =
  32. 32.91² =
  33. 33.81² =
  34. 34.31² =
  35. 35.81² =
  36. 36.69² =
  37. 37.61² =
  38. 38.19² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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