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Application of additive commutative law
(1) Xiaoming bought 88 Jin of apples, 10 Jin of Sydney and 12 Jin of plums. How many Jin of fruit did he buy?

Solution: 88+ 10=98

98+ 12= 1 10

Use additive commutative law.

88+ 12= 100

100+ 10= 1 10

Xiaoming has three math problems to do, five English problems to do and two Chinese problems to do. How many questions does he need to do today?

Answer: 3+5=8 8+2=9.

Use additive commutative law.

3+2=5 5+5= 10

3:

Mingming, Honghong and Fangfang have three pencils respectively. Xiaoming gave Fangfang one first, and Honghong gave Fangfang two. How many pencils does Fangfang have now?

3+ 1=4 4+2=6

Use additive commutative law.

3+2=5 5+ 1=6

Grade 3-6, increase the number yourself! Change the names to Xiaoming and Xiaohong.