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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 124 · 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. 1.71² =
  2. 2.39² =
  3. 3.51² =
  4. 4.21² =
  5. 5.29² =
  6. 6.69² =
  7. 7.59² =
  8. 8.91² =
  9. 9.59² =
  10. 10.31² =
  11. 11.19² =
  12. 12.79² =
  13. 13.49² =
  14. 14.81² =
  15. 15.29² =
  16. 16.39² =
  17. 17.29² =
  18. 18.69² =
  19. 19.19² =
  20. 20.41² =
  21. 21.31² =
  22. 22.41² =
  23. 23.79² =
  24. 24.19² =
  25. 25.41² =
  26. 26.59² =
  27. 27.81² =
  28. 28.91² =
  29. 29.29² =
  30. 30.29² =
  31. 31.89² =
  32. 32.19² =
  33. 33.79² =
  34. 34.21² =
  35. 35.69² =
  36. 36.29² =
  37. 37.89² =
  38. 38.41² =
  39. 39.29² =
  40. 40.59² =

Answer key

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

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