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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 57 · 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. 1.29² =
  2. 2.39² =
  3. 3.59² =
  4. 4.19² =
  5. 5.91² =
  6. 6.41² =
  7. 7.29² =
  8. 8.49² =
  9. 9.71² =
  10. 10.71² =
  11. 11.29² =
  12. 12.91² =
  13. 13.39² =
  14. 14.29² =
  15. 15.91² =
  16. 16.91² =
  17. 17.89² =
  18. 18.21² =
  19. 19.41² =
  20. 20.31² =
  21. 21.59² =
  22. 22.71² =
  23. 23.79² =
  24. 24.29² =
  25. 25.41² =
  26. 26.59² =
  27. 27.19² =
  28. 28.31² =
  29. 29.51² =
  30. 30.31² =
  31. 31.91² =
  32. 32.71² =
  33. 33.19² =
  34. 34.59² =
  35. 35.69² =
  36. 36.49² =
  37. 37.89² =
  38. 38.71² =
  39. 39.29² =
  40. 40.21² =

Answer key

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

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