← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 909 · 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. 2.51² =
  3. 3.59² =
  4. 4.41² =
  5. 5.49² =
  6. 6.41² =
  7. 7.89² =
  8. 8.71² =
  9. 9.79² =
  10. 10.41² =
  11. 11.19² =
  12. 12.29² =
  13. 13.59² =
  14. 14.91² =
  15. 15.39² =
  16. 16.59² =
  17. 17.79² =
  18. 18.59² =
  19. 19.89² =
  20. 20.61² =
  21. 21.31² =
  22. 22.81² =
  23. 23.89² =
  24. 24.81² =
  25. 25.79² =
  26. 26.39² =
  27. 27.89² =
  28. 28.39² =
  29. 29.19² =
  30. 30.21² =
  31. 31.81² =
  32. 32.29² =
  33. 33.21² =
  34. 34.89² =
  35. 35.69² =
  36. 36.19² =
  37. 37.41² =
  38. 38.61² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths