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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 219 · 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. 1.89² =
  2. 2.79² =
  3. 3.29² =
  4. 4.69² =
  5. 5.29² =
  6. 6.21² =
  7. 7.19² =
  8. 8.71² =
  9. 9.71² =
  10. 10.51² =
  11. 11.41² =
  12. 12.61² =
  13. 13.41² =
  14. 14.41² =
  15. 15.71² =
  16. 16.91² =
  17. 17.91² =
  18. 18.21² =
  19. 19.51² =
  20. 20.39² =
  21. 21.61² =
  22. 22.59² =
  23. 23.49² =
  24. 24.41² =
  25. 25.69² =
  26. 26.19² =
  27. 27.89² =
  28. 28.29² =
  29. 29.21² =
  30. 30.79² =
  31. 31.39² =
  32. 32.71² =
  33. 33.19² =
  34. 34.91² =
  35. 35.21² =
  36. 36.79² =
  37. 37.91² =
  38. 38.49² =
  39. 39.19² =
  40. 40.71² =

Answer key

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

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