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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 620 · 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. 1.51² =
  2. 2.89² =
  3. 3.41² =
  4. 4.49² =
  5. 5.19² =
  6. 6.39² =
  7. 7.39² =
  8. 8.69² =
  9. 9.49² =
  10. 10.81² =
  11. 11.69² =
  12. 12.41² =
  13. 13.89² =
  14. 14.71² =
  15. 15.31² =
  16. 16.89² =
  17. 17.69² =
  18. 18.71² =
  19. 19.31² =
  20. 20.49² =
  21. 21.61² =
  22. 22.21² =
  23. 23.79² =
  24. 24.91² =
  25. 25.81² =
  26. 26.31² =
  27. 27.19² =
  28. 28.59² =
  29. 29.21² =
  30. 30.19² =
  31. 31.51² =
  32. 32.29² =
  33. 33.49² =
  34. 34.59² =
  35. 35.71² =
  36. 36.19² =
  37. 37.19² =
  38. 38.29² =
  39. 39.29² =
  40. 40.51² =

Answer key

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

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