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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 302 · 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. 3.31² =
  4. 4.49² =
  5. 5.81² =
  6. 6.51² =
  7. 7.31² =
  8. 8.71² =
  9. 9.31² =
  10. 10.41² =
  11. 11.21² =
  12. 12.19² =
  13. 13.61² =
  14. 14.49² =
  15. 15.89² =
  16. 16.79² =
  17. 17.89² =
  18. 18.41² =
  19. 19.21² =
  20. 20.29² =
  21. 21.81² =
  22. 22.21² =
  23. 23.39² =
  24. 24.19² =
  25. 25.29² =
  26. 26.79² =
  27. 27.91² =
  28. 28.89² =
  29. 29.91² =
  30. 30.59² =
  31. 31.89² =
  32. 32.59² =
  33. 33.19² =
  34. 34.89² =
  35. 35.91² =
  36. 36.59² =
  37. 37.21² =
  38. 38.69² =
  39. 39.71² =
  40. 40.71² =

Answer key

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

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