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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 316 · 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. 2.71² =
  3. 3.89² =
  4. 4.69² =
  5. 5.61² =
  6. 6.71² =
  7. 7.41² =
  8. 8.79² =
  9. 9.79² =
  10. 10.69² =
  11. 11.69² =
  12. 12.81² =
  13. 13.69² =
  14. 14.59² =
  15. 15.59² =
  16. 16.71² =
  17. 17.31² =
  18. 18.81² =
  19. 19.29² =
  20. 20.79² =
  21. 21.21² =
  22. 22.19² =
  23. 23.59² =
  24. 24.31² =
  25. 25.19² =
  26. 26.19² =
  27. 27.49² =
  28. 28.59² =
  29. 29.91² =
  30. 30.79² =
  31. 31.91² =
  32. 32.59² =
  33. 33.51² =
  34. 34.21² =
  35. 35.31² =
  36. 36.79² =
  37. 37.51² =
  38. 38.89² =
  39. 39.51² =
  40. 40.41² =

Answer key

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

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