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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 89 · 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. 1.21² =
  2. 2.49² =
  3. 3.41² =
  4. 4.41² =
  5. 5.41² =
  6. 6.39² =
  7. 7.59² =
  8. 8.49² =
  9. 9.39² =
  10. 10.51² =
  11. 11.49² =
  12. 12.69² =
  13. 13.79² =
  14. 14.31² =
  15. 15.31² =
  16. 16.69² =
  17. 17.39² =
  18. 18.49² =
  19. 19.19² =
  20. 20.49² =
  21. 21.89² =
  22. 22.49² =
  23. 23.59² =
  24. 24.91² =
  25. 25.59² =
  26. 26.21² =
  27. 27.79² =
  28. 28.59² =
  29. 29.21² =
  30. 30.81² =
  31. 31.39² =
  32. 32.79² =
  33. 33.31² =
  34. 34.29² =
  35. 35.79² =
  36. 36.19² =
  37. 37.71² =
  38. 38.61² =
  39. 39.49² =
  40. 40.51² =

Answer key

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

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