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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 243 · 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. 1.41² =
  2. 2.91² =
  3. 3.51² =
  4. 4.51² =
  5. 5.29² =
  6. 6.41² =
  7. 7.61² =
  8. 8.79² =
  9. 9.39² =
  10. 10.81² =
  11. 11.89² =
  12. 12.89² =
  13. 13.29² =
  14. 14.29² =
  15. 15.19² =
  16. 16.81² =
  17. 17.61² =
  18. 18.29² =
  19. 19.59² =
  20. 20.61² =
  21. 21.21² =
  22. 22.29² =
  23. 23.39² =
  24. 24.51² =
  25. 25.29² =
  26. 26.69² =
  27. 27.51² =
  28. 28.89² =
  29. 29.31² =
  30. 30.41² =
  31. 31.89² =
  32. 32.89² =
  33. 33.71² =
  34. 34.61² =
  35. 35.59² =
  36. 36.91² =
  37. 37.71² =
  38. 38.41² =
  39. 39.59² =
  40. 40.51² =

Answer key

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

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