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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 98 · 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. 1.51² =
  2. 2.81² =
  3. 3.49² =
  4. 4.19² =
  5. 5.41² =
  6. 6.41² =
  7. 7.49² =
  8. 8.89² =
  9. 9.59² =
  10. 10.41² =
  11. 11.79² =
  12. 12.89² =
  13. 13.51² =
  14. 14.79² =
  15. 15.61² =
  16. 16.69² =
  17. 17.79² =
  18. 18.39² =
  19. 19.59² =
  20. 20.19² =
  21. 21.41² =
  22. 22.81² =
  23. 23.71² =
  24. 24.89² =
  25. 25.59² =
  26. 26.71² =
  27. 27.19² =
  28. 28.59² =
  29. 29.79² =
  30. 30.61² =
  31. 31.39² =
  32. 32.29² =
  33. 33.29² =
  34. 34.79² =
  35. 35.61² =
  36. 36.49² =
  37. 37.39² =
  38. 38.69² =
  39. 39.29² =
  40. 40.91² =

Answer key

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

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