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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 441 · 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. 2.29² =
  3. 3.79² =
  4. 4.71² =
  5. 5.71² =
  6. 6.69² =
  7. 7.39² =
  8. 8.89² =
  9. 9.49² =
  10. 10.71² =
  11. 11.71² =
  12. 12.59² =
  13. 13.89² =
  14. 14.31² =
  15. 15.81² =
  16. 16.29² =
  17. 17.39² =
  18. 18.29² =
  19. 19.29² =
  20. 20.41² =
  21. 21.89² =
  22. 22.69² =
  23. 23.29² =
  24. 24.49² =
  25. 25.89² =
  26. 26.59² =
  27. 27.91² =
  28. 28.41² =
  29. 29.49² =
  30. 30.91² =
  31. 31.41² =
  32. 32.31² =
  33. 33.71² =
  34. 34.49² =
  35. 35.19² =
  36. 36.81² =
  37. 37.49² =
  38. 38.29² =
  39. 39.91² =
  40. 40.89² =

Answer key

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

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