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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 476 · 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. 1.59² =
  2. 2.21² =
  3. 3.51² =
  4. 4.21² =
  5. 5.59² =
  6. 6.29² =
  7. 7.29² =
  8. 8.39² =
  9. 9.21² =
  10. 10.81² =
  11. 11.39² =
  12. 12.91² =
  13. 13.39² =
  14. 14.89² =
  15. 15.79² =
  16. 16.61² =
  17. 17.41² =
  18. 18.51² =
  19. 19.29² =
  20. 20.91² =
  21. 21.29² =
  22. 22.89² =
  23. 23.19² =
  24. 24.39² =
  25. 25.69² =
  26. 26.49² =
  27. 27.79² =
  28. 28.19² =
  29. 29.41² =
  30. 30.79² =
  31. 31.49² =
  32. 32.49² =
  33. 33.89² =
  34. 34.39² =
  35. 35.31² =
  36. 36.31² =
  37. 37.91² =
  38. 38.91² =
  39. 39.29² =
  40. 40.41² =

Answer key

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

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