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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 58 · 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. 1.89² =
  2. 2.29² =
  3. 3.21² =
  4. 4.79² =
  5. 5.31² =
  6. 6.89² =
  7. 7.49² =
  8. 8.19² =
  9. 9.71² =
  10. 10.89² =
  11. 11.39² =
  12. 12.61² =
  13. 13.39² =
  14. 14.61² =
  15. 15.91² =
  16. 16.59² =
  17. 17.29² =
  18. 18.91² =
  19. 19.79² =
  20. 20.41² =
  21. 21.69² =
  22. 22.21² =
  23. 23.61² =
  24. 24.29² =
  25. 25.89² =
  26. 26.61² =
  27. 27.31² =
  28. 28.41² =
  29. 29.41² =
  30. 30.41² =
  31. 31.21² =
  32. 32.41² =
  33. 33.19² =
  34. 34.79² =
  35. 35.41² =
  36. 36.91² =
  37. 37.89² =
  38. 38.39² =
  39. 39.89² =
  40. 40.89² =

Answer key

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

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