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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 67 · 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. 2.31² =
  3. 3.69² =
  4. 4.49² =
  5. 5.79² =
  6. 6.91² =
  7. 7.49² =
  8. 8.59² =
  9. 9.29² =
  10. 10.79² =
  11. 11.91² =
  12. 12.49² =
  13. 13.31² =
  14. 14.79² =
  15. 15.79² =
  16. 16.69² =
  17. 17.89² =
  18. 18.79² =
  19. 19.71² =
  20. 20.91² =
  21. 21.71² =
  22. 22.71² =
  23. 23.19² =
  24. 24.31² =
  25. 25.29² =
  26. 26.39² =
  27. 27.91² =
  28. 28.59² =
  29. 29.91² =
  30. 30.41² =
  31. 31.89² =
  32. 32.41² =
  33. 33.39² =
  34. 34.29² =
  35. 35.31² =
  36. 36.49² =
  37. 37.39² =
  38. 38.69² =
  39. 39.69² =
  40. 40.71² =

Answer key

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

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