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整十数加、减整十数

整十数加、减整十数. 一 、 口算大比拼 : 3 ＋ 2 2 ＋ 7 6 － 3 9 － 4 5 ＋ 1 7 － 2 5 ＋ 8 8 － 5 50 ＋ 3 6 ＋ 70 18 － 9 13 － 4

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整十数加、减整十数

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  1. 整十数加、减整十数

  2. 一、口算大比拼: 3＋2 2＋7 6－3 9－4 5＋1 7－2 5＋8 8－5 50＋3 6＋70 18－9 13－4 16－5 15－6 28－8 5＋80 =5 =9 =3 =5 =5 =13 =3 =6 =53 =76 =9 =9 =85 =11 =9 =20

  3. 比一比,谁答得又对又快. 1、80里面有( )个十. 2、50里面有5个（ ）。 3、（ ）里面有7个十。 4、6个十是（ ）。 8 十 70 60

  4. 5 9 2 20 50 90

  5. 40 3 43 40 30 70

  6. 2+3+4= 20+30+40= 9 9-4-3= 90-40-30= 2 90 20 10+20+30= 80-10-20= 40+20+30= 90-60+10= 60 50 90 40

  7. 50-10-20=20（个） 50-20-10=20（个） 20+10=30（个） 50-30=20（个）

  8. 排球40元 足球50元 篮球60元 50+40=90（元） 100-90=10（元）

  9. =30 =80 =6 =87 =38 =35 =59 =20 =88 =10

  10. 9 4 4 5 9-5=4(个）

  11. 松树比柳树多多少棵？ 10+20+30=60（棵） 一共有60棵树。 30-10=20（棵） 多20棵 杨树比松树少多少棵？ 30-20=10（棵） 少10棵

  12. 十一（21） 20＋50= 2＋30= 70－30= 30＋6= 40＋20= 50－20= 93－3= 80－60= 3＋70= 30+70= 10+50+20= 80-20-30= 30+40+2= 53-3-20=

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