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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 449 · 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. 2.31² =
  3. 3.19² =
  4. 4.21² =
  5. 5.29² =
  6. 6.81² =
  7. 7.71² =
  8. 8.19² =
  9. 9.39² =
  10. 10.51² =
  11. 11.19² =
  12. 12.81² =
  13. 13.41² =
  14. 14.31² =
  15. 15.29² =
  16. 16.39² =
  17. 17.81² =
  18. 18.21² =
  19. 19.49² =
  20. 20.59² =
  21. 21.81² =
  22. 22.79² =
  23. 23.41² =
  24. 24.79² =
  25. 25.79² =
  26. 26.69² =
  27. 27.21² =
  28. 28.49² =
  29. 29.39² =
  30. 30.59² =
  31. 31.79² =
  32. 32.81² =
  33. 33.41² =
  34. 34.71² =
  35. 35.29² =
  36. 36.21² =
  37. 37.29² =
  38. 38.29² =
  39. 39.91² =
  40. 40.91² =

Answer key

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

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