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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 408 · 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. 1.39² =
  2. 2.79² =
  3. 3.29² =
  4. 4.79² =
  5. 5.59² =
  6. 6.91² =
  7. 7.71² =
  8. 8.29² =
  9. 9.29² =
  10. 10.59² =
  11. 11.91² =
  12. 12.81² =
  13. 13.81² =
  14. 14.51² =
  15. 15.89² =
  16. 16.69² =
  17. 17.21² =
  18. 18.61² =
  19. 19.71² =
  20. 20.71² =
  21. 21.29² =
  22. 22.41² =
  23. 23.31² =
  24. 24.89² =
  25. 25.41² =
  26. 26.21² =
  27. 27.51² =
  28. 28.49² =
  29. 29.19² =
  30. 30.21² =
  31. 31.31² =
  32. 32.19² =
  33. 33.21² =
  34. 34.71² =
  35. 35.61² =
  36. 36.29² =
  37. 37.41² =
  38. 38.89² =
  39. 39.29² =
  40. 40.31² =

Answer key

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

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