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这是什么？

1. 0. 2. 3. 4. 5. 6. 7. 8. 9. 10. 这是什么？. 数射线上百以内的数. 0. 10. 20. 30. 40. 50. 60. 70. 80. 90. 100. 仔细观察，它们有什么共同点？有什么不同？. 1. 0. 2. 3. 4. 5. 6. 7. 8. 9. 10. 0. 0. 10. 10. 20. 20. 30. 30. 40. 40. 50. 50. 60. 60. 70. 70. 80. 80. 90. 90. 100. 100.

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这是什么？

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  1. 1 0 2 3 4 5 6 7 8 9 10 这是什么？

  2. 数射线上百以内的数

  3. 0 10 20 30 40 50 60 70 80 90 100 仔细观察，它们有什么共同点？有什么不同？ 1 0 2 3 4 5 6 7 8 9 10

  4. 0 0 10 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 100 100 从小到大10个10个向右数 从大到小10个10个往左数 10个10个数，什么在变？什么是不变的？

  5. 20 22 24 26 28 30 20 30 0 10 40 50 60 70 80 90 100 20 30 21 23 25 27 29 如何在数射线上标出呢？ 标出20,21,22……30；

  6. 24 28 32 36 0 20 10 30 40 50 60 70 80 90 100 22 26 34 38 如何在数射线上标出呢？ 标出20,22,24……40；

  7. 写出数射线上的数： a b c d e f g h i 0 10 20 30 40 50 60 70 80 90 100 g a = 16 c = 32 e = 57 = 77 i = 98 b = 25 d = 48 f = 64 h = 82

  8. 10 20 80 90 相邻的整十数 0 10 10 20 20 30 40 50 60 70 80 80 90 90 100

  9. 写出与a、b…相邻的整十数。 a b c d e f g h 0 10 20 30 40 50 60 70 80 90 100 a 10 20 30 c 40 e 50 60 80 g 90 b 20 30 50 d 60 f 70 80 h 90 100

  10. 最邻近的整十数 0 10 20 30 40 50 60 70 80 90 100 30 = 28 与28最邻近的整十数是____ 50 = 46 与46最邻近的整十数是____ 80 = 84 与84最邻近的整十数是____

  11. 今天你学到了什么？

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