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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 353 · 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. 1.91² =
  2. 2.49² =
  3. 3.41² =
  4. 4.49² =
  5. 5.59² =
  6. 6.19² =
  7. 7.29² =
  8. 8.71² =
  9. 9.71² =
  10. 10.31² =
  11. 11.79² =
  12. 12.21² =
  13. 13.69² =
  14. 14.59² =
  15. 15.31² =
  16. 16.31² =
  17. 17.39² =
  18. 18.91² =
  19. 19.71² =
  20. 20.69² =
  21. 21.81² =
  22. 22.21² =
  23. 23.69² =
  24. 24.39² =
  25. 25.41² =
  26. 26.21² =
  27. 27.49² =
  28. 28.19² =
  29. 29.21² =
  30. 30.81² =
  31. 31.81² =
  32. 32.41² =
  33. 33.71² =
  34. 34.79² =
  35. 35.69² =
  36. 36.69² =
  37. 37.41² =
  38. 38.91² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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