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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 590 · 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. 1.59² =
  2. 2.89² =
  3. 3.49² =
  4. 4.81² =
  5. 5.39² =
  6. 6.91² =
  7. 7.39² =
  8. 8.49² =
  9. 9.79² =
  10. 10.69² =
  11. 11.29² =
  12. 12.31² =
  13. 13.19² =
  14. 14.59² =
  15. 15.51² =
  16. 16.89² =
  17. 17.49² =
  18. 18.19² =
  19. 19.21² =
  20. 20.89² =
  21. 21.29² =
  22. 22.69² =
  23. 23.71² =
  24. 24.61² =
  25. 25.49² =
  26. 26.29² =
  27. 27.61² =
  28. 28.91² =
  29. 29.81² =
  30. 30.91² =
  31. 31.59² =
  32. 32.41² =
  33. 33.61² =
  34. 34.21² =
  35. 35.71² =
  36. 36.61² =
  37. 37.81² =
  38. 38.51² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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