← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 972 · 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. 1.31² =
  2. 2.51² =
  3. 3.69² =
  4. 4.29² =
  5. 5.19² =
  6. 6.61² =
  7. 7.61² =
  8. 8.29² =
  9. 9.39² =
  10. 10.79² =
  11. 11.91² =
  12. 12.21² =
  13. 13.29² =
  14. 14.59² =
  15. 15.79² =
  16. 16.21² =
  17. 17.39² =
  18. 18.49² =
  19. 19.71² =
  20. 20.31² =
  21. 21.21² =
  22. 22.61² =
  23. 23.81² =
  24. 24.39² =
  25. 25.79² =
  26. 26.81² =
  27. 27.39² =
  28. 28.51² =
  29. 29.59² =
  30. 30.39² =
  31. 31.39² =
  32. 32.49² =
  33. 33.19² =
  34. 34.41² =
  35. 35.71² =
  36. 36.49² =
  37. 37.29² =
  38. 38.51² =
  39. 39.59² =
  40. 40.89² =

Answer key

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

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