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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 213 · 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. 2.21² =
  3. 3.31² =
  4. 4.79² =
  5. 5.59² =
  6. 6.41² =
  7. 7.41² =
  8. 8.59² =
  9. 9.69² =
  10. 10.69² =
  11. 11.89² =
  12. 12.71² =
  13. 13.71² =
  14. 14.49² =
  15. 15.29² =
  16. 16.89² =
  17. 17.19² =
  18. 18.91² =
  19. 19.61² =
  20. 20.51² =
  21. 21.81² =
  22. 22.59² =
  23. 23.69² =
  24. 24.39² =
  25. 25.49² =
  26. 26.21² =
  27. 27.51² =
  28. 28.61² =
  29. 29.51² =
  30. 30.89² =
  31. 31.79² =
  32. 32.51² =
  33. 33.81² =
  34. 34.59² =
  35. 35.71² =
  36. 36.79² =
  37. 37.19² =
  38. 38.29² =
  39. 39.61² =
  40. 40.91² =

Answer key

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

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