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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 560 · 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. 1.81² =
  2. 2.49² =
  3. 3.61² =
  4. 4.49² =
  5. 5.89² =
  6. 6.81² =
  7. 7.69² =
  8. 8.39² =
  9. 9.89² =
  10. 10.69² =
  11. 11.31² =
  12. 12.49² =
  13. 13.41² =
  14. 14.79² =
  15. 15.81² =
  16. 16.79² =
  17. 17.59² =
  18. 18.31² =
  19. 19.19² =
  20. 20.31² =
  21. 21.49² =
  22. 22.41² =
  23. 23.71² =
  24. 24.31² =
  25. 25.31² =
  26. 26.61² =
  27. 27.19² =
  28. 28.61² =
  29. 29.19² =
  30. 30.21² =
  31. 31.91² =
  32. 32.29² =
  33. 33.29² =
  34. 34.89² =
  35. 35.19² =
  36. 36.49² =
  37. 37.81² =
  38. 38.31² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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