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万以内的加法和减法复习

人教新课标二年级数学下册. 万以内的加法和减法复习. 口算. 笔算. 估算. P102 1. 口算下面各题。. =52. 52 + 35 86 - 34 47 + 33. = 87. = 80. = 44. 23 + 69 62 - 18 70 - 26. = 92. = 44. P103 1. 75 - 49. 26. 24 + 38. 62. 2 8 0 7 5 0. 8 4 0 6 5 0. -.

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万以内的加法和减法复习

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  1. 人教新课标二年级数学下册 万以内的加法和减法复习 口算 笔算 估算

  2. P102 1. 口算下面各题。 =52 52 + 35 86 - 34 47 + 33 = 87 = 80 = 44 23 + 69 62 - 18 70 - 26 = 92 = 44

  3. P103 1. 75 - 49 26 24 + 38 62

  4. 2 8 0 7 5 0 8 4 0 6 5 0 - + 280 + 750 = 1030 840 - 650 = 1 1 190 · 0 1 3 0 1 9 0

  5. 知识回顾: 笔算万以内数加减法要注意什么? 要特别注意: 1.相同数位要对齐; 2.从个位算起; 3.进位加:哪一位满十就向前一位进一; 退位减:哪一位不够减就向前一位退一; 结果要记得加进位数或减退位一。

  6. P102 2. 65 + 34 = 99, 650 + 340 = 990。 相同数位 要对齐。 计算下面各题。 = 990 = 640 = 1 210 650 + 340 730 + 480 390 + 250 = 280 = 210 840 - 560 750 - 540 440 - 150 = 290

  7. P103 2. 340 - 180 = 160 自己想一些数,做做看。

  8. 猜一猜,这些数接近哪个整百整十数? 298 703 7008 1298 98 73 246 436 43 1298 597 683 9992 905 629 91 738 1506 604 427

  9. 2.估算 790 190 590 410 ≈980 792 + 186 587 + 412 ≈1000 ≈1000 400 ≈100 600 200 800 440 630 350 250 ≈190 629 – 348 436 – 247 ≈280 300 ≈300 200 ≈200 600 400

  10. P102 3. 二年级有201 人。 一年级197人。 一共有400 个座位。 估算一下,两个年级同时 看木偶戏能不能坐下? 200 200 201 + 197≈ 400(人) 能坐下。

  11. P103 3. 这是亚洲最高的广播电视塔。 中央广播电视塔 高405 米 上海广播电视塔 (东方明珠)高468 米 60 东方明珠比中央广播电视塔大约高 ____ 米。 400 • - 405≈ 60(米)

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