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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 432 · 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. 3.69² =
  4. 4.81² =
  5. 5.19² =
  6. 6.29² =
  7. 7.39² =
  8. 8.49² =
  9. 9.91² =
  10. 10.89² =
  11. 11.19² =
  12. 12.71² =
  13. 13.59² =
  14. 14.39² =
  15. 15.61² =
  16. 16.29² =
  17. 17.69² =
  18. 18.59² =
  19. 19.89² =
  20. 20.69² =
  21. 21.91² =
  22. 22.29² =
  23. 23.79² =
  24. 24.81² =
  25. 25.71² =
  26. 26.49² =
  27. 27.31² =
  28. 28.41² =
  29. 29.49² =
  30. 30.39² =
  31. 31.69² =
  32. 32.91² =
  33. 33.91² =
  34. 34.79² =
  35. 35.39² =
  36. 36.41² =
  37. 37.29² =
  38. 38.49² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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