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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 735 · 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. 2.59² =
  3. 3.61² =
  4. 4.51² =
  5. 5.21² =
  6. 6.21² =
  7. 7.29² =
  8. 8.89² =
  9. 9.21² =
  10. 10.81² =
  11. 11.61² =
  12. 12.41² =
  13. 13.71² =
  14. 14.49² =
  15. 15.59² =
  16. 16.49² =
  17. 17.51² =
  18. 18.71² =
  19. 19.21² =
  20. 20.19² =
  21. 21.69² =
  22. 22.91² =
  23. 23.61² =
  24. 24.29² =
  25. 25.59² =
  26. 26.49² =
  27. 27.79² =
  28. 28.41² =
  29. 29.59² =
  30. 30.41² =
  31. 31.31² =
  32. 32.89² =
  33. 33.51² =
  34. 34.39² =
  35. 35.71² =
  36. 36.81² =
  37. 37.71² =
  38. 38.61² =
  39. 39.89² =
  40. 40.31² =

Answer key

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

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