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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 428 · 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. 1.61² =
  2. 2.51² =
  3. 3.19² =
  4. 4.41² =
  5. 5.89² =
  6. 6.29² =
  7. 7.21² =
  8. 8.49² =
  9. 9.19² =
  10. 10.19² =
  11. 11.41² =
  12. 12.31² =
  13. 13.51² =
  14. 14.41² =
  15. 15.41² =
  16. 16.59² =
  17. 17.49² =
  18. 18.41² =
  19. 19.19² =
  20. 20.41² =
  21. 21.39² =
  22. 22.29² =
  23. 23.19² =
  24. 24.69² =
  25. 25.89² =
  26. 26.59² =
  27. 27.71² =
  28. 28.69² =
  29. 29.41² =
  30. 30.29² =
  31. 31.51² =
  32. 32.19² =
  33. 33.89² =
  34. 34.69² =
  35. 35.19² =
  36. 36.49² =
  37. 37.61² =
  38. 38.79² =
  39. 39.59² =
  40. 40.89² =

Answer key

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

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