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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 657 · 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. 1.19² =
  2. 2.31² =
  3. 3.71² =
  4. 4.21² =
  5. 5.79² =
  6. 6.39² =
  7. 7.69² =
  8. 8.19² =
  9. 9.89² =
  10. 10.69² =
  11. 11.49² =
  12. 12.19² =
  13. 13.39² =
  14. 14.29² =
  15. 15.81² =
  16. 16.41² =
  17. 17.91² =
  18. 18.79² =
  19. 19.59² =
  20. 20.21² =
  21. 21.51² =
  22. 22.51² =
  23. 23.39² =
  24. 24.29² =
  25. 25.89² =
  26. 26.29² =
  27. 27.91² =
  28. 28.91² =
  29. 29.59² =
  30. 30.59² =
  31. 31.59² =
  32. 32.79² =
  33. 33.79² =
  34. 34.71² =
  35. 35.19² =
  36. 36.61² =
  37. 37.29² =
  38. 38.49² =
  39. 39.51² =
  40. 40.59² =

Answer key

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

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