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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 712 · 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. 1.21² =
  2. 2.79² =
  3. 3.49² =
  4. 4.61² =
  5. 5.49² =
  6. 6.69² =
  7. 7.39² =
  8. 8.39² =
  9. 9.21² =
  10. 10.79² =
  11. 11.89² =
  12. 12.59² =
  13. 13.81² =
  14. 14.51² =
  15. 15.61² =
  16. 16.39² =
  17. 17.61² =
  18. 18.69² =
  19. 19.79² =
  20. 20.69² =
  21. 21.71² =
  22. 22.89² =
  23. 23.19² =
  24. 24.91² =
  25. 25.61² =
  26. 26.41² =
  27. 27.59² =
  28. 28.29² =
  29. 29.59² =
  30. 30.71² =
  31. 31.59² =
  32. 32.49² =
  33. 33.49² =
  34. 34.29² =
  35. 35.51² =
  36. 36.89² =
  37. 37.29² =
  38. 38.19² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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