北师大版数学一年级上册 3.11 做个减法表(2)（课件）(共14张PPT)

(共14张PPT)
数一数，想一想
10–8=2
7–4=3
4–3=1
10–6
8–1
6–3
9–4
4
7
5
3
口算，比比看，谁算得又对又快。
4+3
7–1
3+2
9–6
8–3
2+6
7
5
6
8
5
3
7–6
6–4
6–5
7–5
8–0
6–6
6–2
7–3
6–3
9–1
7–1
6–1
6–0
7–7
10–2
6–5
7–6
6–4
6–5
7–5
8–0
6–6
6–2
7–3
6–3
9–1
7–1
6–1
6–0
7–7
10–2
这几个算式都是6减几的。
7–6
6–4
6–5
7–5
8–0
6–6
6–2
7–3
6–3
9–1
7–1
6–1
6–0
7–7
10–2
这几个算式得数都是8。
6
10-4
9-3
8-2
7-1
6-0
5
10-5
9-4
8-3
7-2
6-1
5-0
4
10-6
9-5
8-4
7-3
6-2
5-1
4-0
3
10-7
9-6
8-5
7-4
6-3
5-2
4-1
3-0
2
10-8
9-7
8-6
7-5
6-4
5-3
4-2
3-1
2-0
1
10-9
9-8
8-7
7-6
6-5
5-4
4-3
3-2
2-1
1-0
0
10-10
9-9
8-8
7-7
6-6
5-5
4-4
3-3
2-2
1-1
0-0
7
10-3
9-2
8-1
7-0
8
10-2
9-1
8-0
9
10-1
9-0
10
10-0
横着看你发现了什
么？
第一个数不变，第二个数
递减，差递增。
6
10-4
9-3
8-2
7-1
6-0
5
10-5
9-4
8-3
7-2
6-1
5-0
4
10-6
9-5
8-4
7-3
6-2
5-1
4-0
3
10-7
9-6
8-5
7-4
6-3
5-2
4-1
3-0
2
10-8
9-7
8-6
7-5
6-4
5-3
4-2
3-1
2-0
1
10-9
9-8
8-7
7-6
6-5
5-4
4-3
3-2
2-1
1-0
0
10-10
9-9
8-8
7-7
6-6
5-5
4-4
3-3
2-2
1-1
0-0
7
10-3
9-2
8-1
7-0
8
10-2
9-1
8-0
9
10-1
9-0
10
10-0
竖着看你又发现了什么？
第一个数递减，第二个数递减，差不变。
6
10-4
9-3
8-2
7-1
6-0
5
10-5
9-4
8-3
7-2
6-1
5-0
4
10-6
9-5
8-4
7-3
6-2
5-1
4-0
3
10-7
9-6
8-5
7-4
6-3
5-2
4-1
3-0
2
10-8
9-7
8-6
7-5
6-4
5-3
4-2
3-1
2-0
1
10-9
9-8
8-7
7-6
6-5
5-4
4-3
3-2
2-1
1-0
0
10-10
9-9
8-8
7-7
6-6
5-5
4-4
3-3
2-2
1-1
0-0
7
10-3
9-2
8-1
7-0
8
10-2
9-1
8-0
9
10-1
9-0
10
10-0
斜着看呢？
第一个数递减，第二个数不变，差递减。
本节课你都学了哪些内容？自己总结一下，同学之间互相讨论一下！