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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 677 · 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. 1.21² =
  2. 2.79² =
  3. 3.49² =
  4. 4.69² =
  5. 5.41² =
  6. 6.91² =
  7. 7.31² =
  8. 8.79² =
  9. 9.29² =
  10. 10.19² =
  11. 11.49² =
  12. 12.89² =
  13. 13.39² =
  14. 14.29² =
  15. 15.31² =
  16. 16.61² =
  17. 17.49² =
  18. 18.71² =
  19. 19.91² =
  20. 20.39² =
  21. 21.91² =
  22. 22.19² =
  23. 23.91² =
  24. 24.21² =
  25. 25.79² =
  26. 26.41² =
  27. 27.21² =
  28. 28.19² =
  29. 29.71² =
  30. 30.59² =
  31. 31.49² =
  32. 32.81² =
  33. 33.31² =
  34. 34.49² =
  35. 35.89² =
  36. 36.71² =
  37. 37.19² =
  38. 38.79² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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