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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 307 · 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. 1.49² =
  2. 2.89² =
  3. 3.41² =
  4. 4.81² =
  5. 5.31² =
  6. 6.91² =
  7. 7.39² =
  8. 8.29² =
  9. 9.31² =
  10. 10.19² =
  11. 11.91² =
  12. 12.21² =
  13. 13.69² =
  14. 14.39² =
  15. 15.29² =
  16. 16.69² =
  17. 17.89² =
  18. 18.59² =
  19. 19.29² =
  20. 20.29² =
  21. 21.49² =
  22. 22.39² =
  23. 23.61² =
  24. 24.59² =
  25. 25.29² =
  26. 26.79² =
  27. 27.59² =
  28. 28.31² =
  29. 29.59² =
  30. 30.59² =
  31. 31.61² =
  32. 32.49² =
  33. 33.21² =
  34. 34.69² =
  35. 35.19² =
  36. 36.21² =
  37. 37.49² =
  38. 38.71² =
  39. 39.69² =
  40. 40.31² =

Answer key

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

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