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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 602 · 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. 1.49² =
  2. 2.79² =
  3. 3.59² =
  4. 4.51² =
  5. 5.21² =
  6. 6.41² =
  7. 7.31² =
  8. 8.39² =
  9. 9.89² =
  10. 10.31² =
  11. 11.29² =
  12. 12.81² =
  13. 13.41² =
  14. 14.89² =
  15. 15.59² =
  16. 16.49² =
  17. 17.21² =
  18. 18.49² =
  19. 19.71² =
  20. 20.49² =
  21. 21.31² =
  22. 22.39² =
  23. 23.29² =
  24. 24.79² =
  25. 25.29² =
  26. 26.19² =
  27. 27.49² =
  28. 28.59² =
  29. 29.69² =
  30. 30.91² =
  31. 31.89² =
  32. 32.49² =
  33. 33.89² =
  34. 34.39² =
  35. 35.69² =
  36. 36.61² =
  37. 37.81² =
  38. 38.71² =
  39. 39.59² =
  40. 40.41² =

Answer key

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

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