10以内的连加连减可以通过以下几种方法进行练习:
直接计算
7 + 6 + 3 = 10
4 + 3 + 2 = 9
9 - 2 - 4 = 3
利用加法和减法的交换律和结合律
7 + 6 + 3 = 7 + 3 + 6 = (7 + 3) + 6 = 10 + 6 = 16
4 + 3 + 2 = 4 + (3 + 2) = 4 + 5 = 9
使用口诀
加九减一:8 + 9 = 17,8 - 1 = 7,所以 8 + 9 - 1 = 17 - 1 = 16
减九加一:9 - 1 = 8,9 + 1 = 10,所以 9 - 1 + 10 = 8 + 10 = 18
练习题
3 + 3 + 1 = 7
9 + 1 - 4 = 6
5 - 2 - 1 = 2
5 - 4 + 4 = 5
5 + 5 - 2 = 8
3 - 2 + 6 = 7
2 - 2 + 7 = 7
1 + 2 - 3 = 0
6 - 5 - 1 = 0
1 + 8 - 5 = 4
7 + 1 + 2 = 10
3 + 5 - 3 = 5
7 - 7 + 3 = 3
7 + 1 + 2 = 10
6 - 2 - 1 = 3
3 - 2 + 2 = 3
通过以上方法,可以有效地练习10以内的连加连减,提高计算能力和逻辑思维能力。建议多做练习题,加深理解和熟练技巧。