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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 201 · 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. 3.69² =
  4. 4.39² =
  5. 5.91² =
  6. 6.71² =
  7. 7.89² =
  8. 8.81² =
  9. 9.21² =
  10. 10.91² =
  11. 11.49² =
  12. 12.29² =
  13. 13.29² =
  14. 14.91² =
  15. 15.59² =
  16. 16.31² =
  17. 17.71² =
  18. 18.19² =
  19. 19.21² =
  20. 20.61² =
  21. 21.59² =
  22. 22.51² =
  23. 23.89² =
  24. 24.21² =
  25. 25.59² =
  26. 26.71² =
  27. 27.39² =
  28. 28.79² =
  29. 29.89² =
  30. 30.51² =
  31. 31.39² =
  32. 32.19² =
  33. 33.31² =
  34. 34.61² =
  35. 35.51² =
  36. 36.59² =
  37. 37.61² =
  38. 38.91² =
  39. 39.31² =
  40. 40.41² =

Answer key

  1. 841
  2. 441
  3. 4761
  4. 1521
  5. 8281
  6. 5041
  7. 7921
  8. 6561
  9. 441
  10. 8281
  11. 2401
  12. 841
  13. 841
  14. 8281
  15. 3481
  16. 961
  17. 5041
  18. 361
  19. 441
  20. 3721
  21. 3481
  22. 2601
  23. 7921
  24. 441
  25. 3481
  26. 5041
  27. 1521
  28. 6241
  29. 7921
  30. 2601
  31. 1521
  32. 361
  33. 961
  34. 3721
  35. 2601
  36. 3481
  37. 3721
  38. 8281
  39. 961
  40. 1681

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