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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 290 · 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. 2.31² =
  3. 3.19² =
  4. 4.31² =
  5. 5.49² =
  6. 6.89² =
  7. 7.89² =
  8. 8.59² =
  9. 9.79² =
  10. 10.39² =
  11. 11.19² =
  12. 12.81² =
  13. 13.19² =
  14. 14.49² =
  15. 15.69² =
  16. 16.21² =
  17. 17.39² =
  18. 18.79² =
  19. 19.51² =
  20. 20.19² =
  21. 21.41² =
  22. 22.79² =
  23. 23.39² =
  24. 24.21² =
  25. 25.41² =
  26. 26.21² =
  27. 27.79² =
  28. 28.39² =
  29. 29.29² =
  30. 30.29² =
  31. 31.61² =
  32. 32.51² =
  33. 33.89² =
  34. 34.19² =
  35. 35.69² =
  36. 36.29² =
  37. 37.51² =
  38. 38.91² =
  39. 39.79² =
  40. 40.29² =

Answer key

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

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