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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 87 · 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. 1.21² =
  2. 2.59² =
  3. 3.19² =
  4. 4.21² =
  5. 5.49² =
  6. 6.21² =
  7. 7.69² =
  8. 8.19² =
  9. 9.41² =
  10. 10.81² =
  11. 11.29² =
  12. 12.91² =
  13. 13.19² =
  14. 14.21² =
  15. 15.91² =
  16. 16.29² =
  17. 17.59² =
  18. 18.49² =
  19. 19.69² =
  20. 20.49² =
  21. 21.39² =
  22. 22.39² =
  23. 23.19² =
  24. 24.71² =
  25. 25.39² =
  26. 26.29² =
  27. 27.79² =
  28. 28.39² =
  29. 29.79² =
  30. 30.61² =
  31. 31.71² =
  32. 32.29² =
  33. 33.49² =
  34. 34.21² =
  35. 35.29² =
  36. 36.31² =
  37. 37.19² =
  38. 38.91² =
  39. 39.39² =
  40. 40.29² =

Answer key

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

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