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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 557 · 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. 1.41² =
  2. 2.31² =
  3. 3.71² =
  4. 4.41² =
  5. 5.39² =
  6. 6.31² =
  7. 7.31² =
  8. 8.51² =
  9. 9.71² =
  10. 10.69² =
  11. 11.21² =
  12. 12.19² =
  13. 13.39² =
  14. 14.49² =
  15. 15.31² =
  16. 16.19² =
  17. 17.59² =
  18. 18.19² =
  19. 19.79² =
  20. 20.29² =
  21. 21.69² =
  22. 22.79² =
  23. 23.49² =
  24. 24.81² =
  25. 25.19² =
  26. 26.41² =
  27. 27.69² =
  28. 28.71² =
  29. 29.79² =
  30. 30.89² =
  31. 31.71² =
  32. 32.71² =
  33. 33.29² =
  34. 34.81² =
  35. 35.59² =
  36. 36.29² =
  37. 37.29² =
  38. 38.49² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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