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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 173 · 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. 1.91² =
  2. 2.89² =
  3. 3.41² =
  4. 4.79² =
  5. 5.19² =
  6. 6.59² =
  7. 7.91² =
  8. 8.19² =
  9. 9.29² =
  10. 10.59² =
  11. 11.39² =
  12. 12.69² =
  13. 13.31² =
  14. 14.31² =
  15. 15.91² =
  16. 16.39² =
  17. 17.19² =
  18. 18.29² =
  19. 19.81² =
  20. 20.49² =
  21. 21.19² =
  22. 22.71² =
  23. 23.39² =
  24. 24.21² =
  25. 25.81² =
  26. 26.19² =
  27. 27.91² =
  28. 28.29² =
  29. 29.79² =
  30. 30.21² =
  31. 31.49² =
  32. 32.59² =
  33. 33.89² =
  34. 34.91² =
  35. 35.69² =
  36. 36.71² =
  37. 37.49² =
  38. 38.39² =
  39. 39.51² =
  40. 40.89² =

Answer key

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

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