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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 197 · 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. 1.21² =
  2. 2.79² =
  3. 3.91² =
  4. 4.31² =
  5. 5.41² =
  6. 6.59² =
  7. 7.91² =
  8. 8.49² =
  9. 9.59² =
  10. 10.69² =
  11. 11.69² =
  12. 12.71² =
  13. 13.59² =
  14. 14.39² =
  15. 15.29² =
  16. 16.59² =
  17. 17.29² =
  18. 18.21² =
  19. 19.81² =
  20. 20.71² =
  21. 21.49² =
  22. 22.19² =
  23. 23.59² =
  24. 24.69² =
  25. 25.21² =
  26. 26.69² =
  27. 27.29² =
  28. 28.61² =
  29. 29.91² =
  30. 30.31² =
  31. 31.79² =
  32. 32.51² =
  33. 33.91² =
  34. 34.49² =
  35. 35.69² =
  36. 36.39² =
  37. 37.49² =
  38. 38.71² =
  39. 39.69² =
  40. 40.59² =

Answer key

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

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