课件22张PPT。5113113121424422231、按顺序填数
( ) 3 ( ) 5
2、看算式,写得数
2+3 1+4 2+2 3+1 42=5 =5 =4 =4 5以内的减法人教新课标一年级数学上册312—减号3减1等于2132=—读作:4减2等于2242=鱼 ! !3–2 = 1231143635 – 1 = 45 – 1 = 45 – 2 = 35 – 1 = 45 – 2 = 35 – 3 = 25 – 1 = 45 – 2 = 35 – 3 = 25 – 4 = 13-2=12-1=15-3=2摆一摆,再说算式.5-2=35-1=5-4=摆一摆.4-1=4- =1 + 2=5 – 3=3 – 2=2 + 2=5 – 4=4 + 2=6 – 3=5 – 2=312613431 + 2=5 – 3=3 – 2=2 + 2=5 – 4=4 + 2=6 – 3=5 – 2=3126134321123121321
想一想,生活中哪些地方用到了减法?
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