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100以内列竖式计算

77-46+32 65-38+26 79+19-56 56+74-26 = = = = = = = = 58-36+27 84-27+16= 4+27-16 = = = = = = 93+23+94 69-(39-23) 99+(25-24) = = = = = = 77-76+32 61-38+26 79+19-16 16+77-26 = = = = = = = = 18-36+27 87-27+16 30+(23

0.4*125*25*0.8 =(0.4*25)*(125*0.8)=10*100=1000 1.25*(8+10) =1.25*8+1.25*10=10+12.5=22.5 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2 1.24*8.3+8.3*1.76 =8.3*(1.24+1.76)=8.3*3=24.9 9999*1001 =9999*(1000+1)=9999*1000+

正确的思路是这样的:例如:100-35,列竖式 100- 35从个位算起,0-5不够减,从10位退1;十位是0,不够减,从百位退1.百位退1 是退了100,10个10.十位有了10个10,退给个位一个10.个位就是10-5等于5.十位就是10退1等于9,9-3等于6,.百位是1-1等于0.所以,标记退位点的时候其实是从百位先标记退位点,再标记十位,然后再相减.(不过这个是退位的逻辑关系,实际上做题之后从十位退一次相减一次,并不一定要像说的那么复杂)其实这个十位相当于一个中间人.他从100那里“要”回来100,分成了10份,就是10个10.他拿了一个10给了个位,自己存下来9个10.

从各位算起,满十进一,算十位时别忘了把进位的数忘记,百位也是如此

26+46=88-19=88-66=17+43=18+67=57-31=95-90=90-58=10+20=19+62=78-62=54-46=23+25=78-15=42-31=23+58=75-23=63-33=31+49=38+41=44-29=78-31=69-15=64-50=13+50=88-68=67-33=22+65=89-14=20-16=63-30=28-13=47-11=99-

0.35*1.250.36 * 35 4.3 * 0.28 3. 16 * 0.17 5.1 * 162.72 * 2.5 0.37 * 2.4 5.3 * 0.32 9.4 * 2.31.75 * 8.5 1.2 * 3.1 4.3 * 0.9 0.32 * 0.260.24 * 1.8 32 * 0.14 0.53 * 1.2 3 * 1.5 2.6*25 1.06*30 0.156*15 24*0.9 02*1.7 2.35*84 28*0.63 0.094*0.12 0.125*

640÷80= 15*5= 23*3= 12*2*5= 480÷80= 16*5= 27*3= 90÷15= 48÷4= 640÷16= 39÷3= 24*20= 32*3= 48÷16= 12*8= 27*3= 56÷14= 2

25 -15 -80 = 10 -80 = -70 26 -6 -64 = 20 -64 = -44 27 + 3 -48 = 30 -48 = -18 28 + 12 -32 = 40 -32 = 8 29 + 21 -16 = 50 -16 = 34 30 + 30 + 0 = 60 + 0 = 60 31 + 39 + 16 = 70 + 16 = 86 32 + 48 + 32 = 80 + 32 = 112 33 + 57 + 48 = 90 + 48 = 138 34 +

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