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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 152 · 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. 3.31² =
  4. 4.89² =
  5. 5.71² =
  6. 6.39² =
  7. 7.89² =
  8. 8.41² =
  9. 9.71² =
  10. 10.41² =
  11. 11.79² =
  12. 12.19² =
  13. 13.81² =
  14. 14.71² =
  15. 15.69² =
  16. 16.41² =
  17. 17.71² =
  18. 18.49² =
  19. 19.39² =
  20. 20.39² =
  21. 21.39² =
  22. 22.81² =
  23. 23.89² =
  24. 24.59² =
  25. 25.91² =
  26. 26.81² =
  27. 27.41² =
  28. 28.21² =
  29. 29.69² =
  30. 30.69² =
  31. 31.21² =
  32. 32.29² =
  33. 33.39² =
  34. 34.61² =
  35. 35.91² =
  36. 36.29² =
  37. 37.31² =
  38. 38.71² =
  39. 39.39² =
  40. 40.41² =

Answer key

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

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