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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 714 · 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. 2.31² =
  3. 3.41² =
  4. 4.81² =
  5. 5.79² =
  6. 6.71² =
  7. 7.79² =
  8. 8.41² =
  9. 9.69² =
  10. 10.29² =
  11. 11.21² =
  12. 12.61² =
  13. 13.61² =
  14. 14.81² =
  15. 15.49² =
  16. 16.59² =
  17. 17.19² =
  18. 18.81² =
  19. 19.91² =
  20. 20.59² =
  21. 21.49² =
  22. 22.89² =
  23. 23.21² =
  24. 24.41² =
  25. 25.69² =
  26. 26.29² =
  27. 27.29² =
  28. 28.49² =
  29. 29.21² =
  30. 30.49² =
  31. 31.41² =
  32. 32.39² =
  33. 33.19² =
  34. 34.91² =
  35. 35.29² =
  36. 36.71² =
  37. 37.49² =
  38. 38.59² =
  39. 39.31² =
  40. 40.51² =

Answer key

  1. 1681
  2. 961
  3. 1681
  4. 6561
  5. 6241
  6. 5041
  7. 6241
  8. 1681
  9. 4761
  10. 841
  11. 441
  12. 3721
  13. 3721
  14. 6561
  15. 2401
  16. 3481
  17. 361
  18. 6561
  19. 8281
  20. 3481
  21. 2401
  22. 7921
  23. 441
  24. 1681
  25. 4761
  26. 841
  27. 841
  28. 2401
  29. 441
  30. 2401
  31. 1681
  32. 1521
  33. 361
  34. 8281
  35. 841
  36. 5041
  37. 2401
  38. 3481
  39. 961
  40. 2601

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