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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 102 · 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. 1.49² =
  2. 2.21² =
  3. 3.81² =
  4. 4.61² =
  5. 5.91² =
  6. 6.19² =
  7. 7.61² =
  8. 8.69² =
  9. 9.51² =
  10. 10.19² =
  11. 11.51² =
  12. 12.31² =
  13. 13.21² =
  14. 14.69² =
  15. 15.59² =
  16. 16.21² =
  17. 17.59² =
  18. 18.69² =
  19. 19.91² =
  20. 20.29² =
  21. 21.21² =
  22. 22.69² =
  23. 23.71² =
  24. 24.39² =
  25. 25.89² =
  26. 26.79² =
  27. 27.61² =
  28. 28.29² =
  29. 29.19² =
  30. 30.71² =
  31. 31.59² =
  32. 32.89² =
  33. 33.31² =
  34. 34.39² =
  35. 35.61² =
  36. 36.21² =
  37. 37.91² =
  38. 38.81² =
  39. 39.59² =
  40. 40.71² =

Answer key

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

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