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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 354 · 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. 2.59² =
  3. 3.61² =
  4. 4.71² =
  5. 5.71² =
  6. 6.91² =
  7. 7.41² =
  8. 8.29² =
  9. 9.89² =
  10. 10.41² =
  11. 11.79² =
  12. 12.61² =
  13. 13.41² =
  14. 14.39² =
  15. 15.41² =
  16. 16.49² =
  17. 17.21² =
  18. 18.31² =
  19. 19.79² =
  20. 20.49² =
  21. 21.69² =
  22. 22.19² =
  23. 23.91² =
  24. 24.29² =
  25. 25.59² =
  26. 26.81² =
  27. 27.81² =
  28. 28.61² =
  29. 29.29² =
  30. 30.51² =
  31. 31.29² =
  32. 32.49² =
  33. 33.71² =
  34. 34.81² =
  35. 35.69² =
  36. 36.21² =
  37. 37.19² =
  38. 38.81² =
  39. 39.49² =
  40. 40.69² =

Answer key

  1. 441
  2. 3481
  3. 3721
  4. 5041
  5. 5041
  6. 8281
  7. 1681
  8. 841
  9. 7921
  10. 1681
  11. 6241
  12. 3721
  13. 1681
  14. 1521
  15. 1681
  16. 2401
  17. 441
  18. 961
  19. 6241
  20. 2401
  21. 4761
  22. 361
  23. 8281
  24. 841
  25. 3481
  26. 6561
  27. 6561
  28. 3721
  29. 841
  30. 2601
  31. 841
  32. 2401
  33. 5041
  34. 6561
  35. 4761
  36. 441
  37. 361
  38. 6561
  39. 2401
  40. 4761

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