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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 248 · 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. 1.49² =
  2. 2.61² =
  3. 3.69² =
  4. 4.31² =
  5. 5.61² =
  6. 6.81² =
  7. 7.39² =
  8. 8.69² =
  9. 9.51² =
  10. 10.71² =
  11. 11.61² =
  12. 12.41² =
  13. 13.79² =
  14. 14.49² =
  15. 15.31² =
  16. 16.91² =
  17. 17.51² =
  18. 18.71² =
  19. 19.59² =
  20. 20.59² =
  21. 21.29² =
  22. 22.89² =
  23. 23.91² =
  24. 24.29² =
  25. 25.19² =
  26. 26.79² =
  27. 27.51² =
  28. 28.29² =
  29. 29.69² =
  30. 30.71² =
  31. 31.31² =
  32. 32.79² =
  33. 33.29² =
  34. 34.41² =
  35. 35.19² =
  36. 36.29² =
  37. 37.69² =
  38. 38.29² =
  39. 39.79² =
  40. 40.49² =

Answer key

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

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