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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 402 · 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. 2.41² =
  3. 3.41² =
  4. 4.41² =
  5. 5.49² =
  6. 6.21² =
  7. 7.71² =
  8. 8.59² =
  9. 9.29² =
  10. 10.49² =
  11. 11.89² =
  12. 12.81² =
  13. 13.19² =
  14. 14.49² =
  15. 15.79² =
  16. 16.31² =
  17. 17.51² =
  18. 18.71² =
  19. 19.31² =
  20. 20.39² =
  21. 21.79² =
  22. 22.29² =
  23. 23.69² =
  24. 24.79² =
  25. 25.61² =
  26. 26.21² =
  27. 27.71² =
  28. 28.71² =
  29. 29.19² =
  30. 30.41² =
  31. 31.69² =
  32. 32.61² =
  33. 33.71² =
  34. 34.31² =
  35. 35.19² =
  36. 36.29² =
  37. 37.41² =
  38. 38.49² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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