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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 300 · 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. 1.81² =
  2. 2.79² =
  3. 3.89² =
  4. 4.31² =
  5. 5.61² =
  6. 6.51² =
  7. 7.79² =
  8. 8.71² =
  9. 9.79² =
  10. 10.69² =
  11. 11.49² =
  12. 12.91² =
  13. 13.81² =
  14. 14.59² =
  15. 15.79² =
  16. 16.49² =
  17. 17.91² =
  18. 18.39² =
  19. 19.19² =
  20. 20.81² =
  21. 21.69² =
  22. 22.19² =
  23. 23.71² =
  24. 24.21² =
  25. 25.89² =
  26. 26.89² =
  27. 27.69² =
  28. 28.89² =
  29. 29.81² =
  30. 30.29² =
  31. 31.81² =
  32. 32.19² =
  33. 33.41² =
  34. 34.91² =
  35. 35.59² =
  36. 36.29² =
  37. 37.49² =
  38. 38.31² =
  39. 39.19² =
  40. 40.71² =

Answer key

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

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