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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 787 · 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. 2.71² =
  3. 3.59² =
  4. 4.31² =
  5. 5.79² =
  6. 6.69² =
  7. 7.41² =
  8. 8.61² =
  9. 9.89² =
  10. 10.31² =
  11. 11.31² =
  12. 12.21² =
  13. 13.79² =
  14. 14.81² =
  15. 15.79² =
  16. 16.91² =
  17. 17.69² =
  18. 18.19² =
  19. 19.19² =
  20. 20.21² =
  21. 21.89² =
  22. 22.49² =
  23. 23.61² =
  24. 24.49² =
  25. 25.89² =
  26. 26.31² =
  27. 27.89² =
  28. 28.89² =
  29. 29.69² =
  30. 30.61² =
  31. 31.29² =
  32. 32.89² =
  33. 33.81² =
  34. 34.89² =
  35. 35.39² =
  36. 36.19² =
  37. 37.39² =
  38. 38.31² =
  39. 39.69² =
  40. 40.19² =

Answer key

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

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