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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 374 · 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. 1.29² =
  2. 2.21² =
  3. 3.81² =
  4. 4.21² =
  5. 5.31² =
  6. 6.51² =
  7. 7.89² =
  8. 8.31² =
  9. 9.21² =
  10. 10.69² =
  11. 11.19² =
  12. 12.49² =
  13. 13.29² =
  14. 14.39² =
  15. 15.69² =
  16. 16.89² =
  17. 17.39² =
  18. 18.41² =
  19. 19.71² =
  20. 20.41² =
  21. 21.59² =
  22. 22.31² =
  23. 23.49² =
  24. 24.91² =
  25. 25.41² =
  26. 26.59² =
  27. 27.31² =
  28. 28.49² =
  29. 29.79² =
  30. 30.21² =
  31. 31.19² =
  32. 32.19² =
  33. 33.41² =
  34. 34.39² =
  35. 35.81² =
  36. 36.69² =
  37. 37.39² =
  38. 38.39² =
  39. 39.89² =
  40. 40.59² =

Answer key

  1. 841
  2. 441
  3. 6561
  4. 441
  5. 961
  6. 2601
  7. 7921
  8. 961
  9. 441
  10. 4761
  11. 361
  12. 2401
  13. 841
  14. 1521
  15. 4761
  16. 7921
  17. 1521
  18. 1681
  19. 5041
  20. 1681
  21. 3481
  22. 961
  23. 2401
  24. 8281
  25. 1681
  26. 3481
  27. 961
  28. 2401
  29. 6241
  30. 441
  31. 361
  32. 361
  33. 1681
  34. 1521
  35. 6561
  36. 4761
  37. 1521
  38. 1521
  39. 7921
  40. 3481

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