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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 226 · 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. 1.41² =
  2. 2.19² =
  3. 3.69² =
  4. 4.71² =
  5. 5.51² =
  6. 6.59² =
  7. 7.41² =
  8. 8.39² =
  9. 9.89² =
  10. 10.31² =
  11. 11.71² =
  12. 12.21² =
  13. 13.79² =
  14. 14.49² =
  15. 15.71² =
  16. 16.21² =
  17. 17.69² =
  18. 18.21² =
  19. 19.89² =
  20. 20.89² =
  21. 21.31² =
  22. 22.91² =
  23. 23.79² =
  24. 24.89² =
  25. 25.39² =
  26. 26.89² =
  27. 27.79² =
  28. 28.81² =
  29. 29.59² =
  30. 30.49² =
  31. 31.89² =
  32. 32.19² =
  33. 33.19² =
  34. 34.21² =
  35. 35.61² =
  36. 36.31² =
  37. 37.29² =
  38. 38.59² =
  39. 39.51² =
  40. 40.51² =

Answer key

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

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