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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 649 · 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. 1.41² =
  2. 2.21² =
  3. 3.71² =
  4. 4.81² =
  5. 5.71² =
  6. 6.69² =
  7. 7.29² =
  8. 8.41² =
  9. 9.31² =
  10. 10.31² =
  11. 11.61² =
  12. 12.49² =
  13. 13.49² =
  14. 14.81² =
  15. 15.19² =
  16. 16.61² =
  17. 17.41² =
  18. 18.21² =
  19. 19.81² =
  20. 20.71² =
  21. 21.49² =
  22. 22.89² =
  23. 23.59² =
  24. 24.49² =
  25. 25.49² =
  26. 26.39² =
  27. 27.19² =
  28. 28.91² =
  29. 29.21² =
  30. 30.31² =
  31. 31.81² =
  32. 32.59² =
  33. 33.71² =
  34. 34.29² =
  35. 35.91² =
  36. 36.39² =
  37. 37.71² =
  38. 38.69² =
  39. 39.79² =
  40. 40.71² =

Answer key

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

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