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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 495 · 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. 1.89² =
  2. 2.39² =
  3. 3.71² =
  4. 4.29² =
  5. 5.69² =
  6. 6.59² =
  7. 7.21² =
  8. 8.81² =
  9. 9.31² =
  10. 10.29² =
  11. 11.41² =
  12. 12.41² =
  13. 13.71² =
  14. 14.19² =
  15. 15.89² =
  16. 16.39² =
  17. 17.69² =
  18. 18.29² =
  19. 19.41² =
  20. 20.61² =
  21. 21.91² =
  22. 22.19² =
  23. 23.31² =
  24. 24.59² =
  25. 25.41² =
  26. 26.51² =
  27. 27.49² =
  28. 28.39² =
  29. 29.19² =
  30. 30.61² =
  31. 31.89² =
  32. 32.59² =
  33. 33.19² =
  34. 34.89² =
  35. 35.31² =
  36. 36.29² =
  37. 37.61² =
  38. 38.79² =
  39. 39.39² =
  40. 40.19² =

Answer key

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

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