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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 275 · 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. 2.51² =
  3. 3.29² =
  4. 4.49² =
  5. 5.19² =
  6. 6.41² =
  7. 7.91² =
  8. 8.19² =
  9. 9.21² =
  10. 10.21² =
  11. 11.31² =
  12. 12.21² =
  13. 13.29² =
  14. 14.31² =
  15. 15.19² =
  16. 16.49² =
  17. 17.61² =
  18. 18.89² =
  19. 19.31² =
  20. 20.91² =
  21. 21.51² =
  22. 22.31² =
  23. 23.79² =
  24. 24.71² =
  25. 25.61² =
  26. 26.29² =
  27. 27.49² =
  28. 28.31² =
  29. 29.49² =
  30. 30.49² =
  31. 31.49² =
  32. 32.29² =
  33. 33.39² =
  34. 34.91² =
  35. 35.89² =
  36. 36.59² =
  37. 37.69² =
  38. 38.39² =
  39. 39.41² =
  40. 40.39² =

Answer key

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

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