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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 429 · 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. 2.59² =
  3. 3.51² =
  4. 4.59² =
  5. 5.79² =
  6. 6.81² =
  7. 7.91² =
  8. 8.29² =
  9. 9.71² =
  10. 10.69² =
  11. 11.71² =
  12. 12.21² =
  13. 13.39² =
  14. 14.91² =
  15. 15.21² =
  16. 16.61² =
  17. 17.19² =
  18. 18.89² =
  19. 19.61² =
  20. 20.79² =
  21. 21.69² =
  22. 22.49² =
  23. 23.19² =
  24. 24.41² =
  25. 25.89² =
  26. 26.81² =
  27. 27.89² =
  28. 28.29² =
  29. 29.59² =
  30. 30.89² =
  31. 31.71² =
  32. 32.41² =
  33. 33.21² =
  34. 34.31² =
  35. 35.49² =
  36. 36.39² =
  37. 37.81² =
  38. 38.21² =
  39. 39.59² =
  40. 40.89² =

Answer key

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

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