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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 285 · 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. 3.91² =
  4. 4.31² =
  5. 5.31² =
  6. 6.29² =
  7. 7.29² =
  8. 8.69² =
  9. 9.19² =
  10. 10.29² =
  11. 11.41² =
  12. 12.89² =
  13. 13.61² =
  14. 14.29² =
  15. 15.51² =
  16. 16.29² =
  17. 17.59² =
  18. 18.79² =
  19. 19.81² =
  20. 20.39² =
  21. 21.91² =
  22. 22.61² =
  23. 23.31² =
  24. 24.71² =
  25. 25.89² =
  26. 26.91² =
  27. 27.39² =
  28. 28.51² =
  29. 29.61² =
  30. 30.19² =
  31. 31.61² =
  32. 32.71² =
  33. 33.19² =
  34. 34.61² =
  35. 35.19² =
  36. 36.59² =
  37. 37.81² =
  38. 38.71² =
  39. 39.81² =
  40. 40.29² =

Answer key

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

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