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妈妈总说为我操碎了心。看见她疲惫的身影,我却感到不解:妈妈怎么会这么累呢?今天是星期六,我睡了个懒觉。要起床时,我喊妈妈帮我拿衣服。正在厨房洗碗的妈妈听见,连忙来到我的房间,为我拿衣服。她问我:“我每天给你洗你在学校吃早餐用的碗,想想,这个碗我洗了多少次?”我一下子来精神了,马上计算起来:我上了4年学,每年2个学期,按每学期20周计算,每周在学校吃5天早餐。先算每学期洗了多少次,再算一年洗了多少次,最后算4年洗了多少次。列式是5×20×2×4=800(次)。这个结果令我大吃一惊:光在学校吃早餐用的碗,妈妈就为我洗了800次!
My mother always said to me broken heart. I saw her tired figure, but I puzzled: how could my mother be so tired? Today is Saturday, I slept a lazy. To wake up, I call my mom to help me get my clothes. Mother washing the kitchen was heard, quickly came to my room, get clothes for me. She asked me: “I wash your bowl for breakfast every day at school, and think about how many times I wash this bowl?” "I was spiritually at once, and now I counted: I went to school for 4 years , 2 semesters per year, calculated at 20 weeks per semester, and 5 days of breakfast at school each week. First count how many times each semester was washed, and then count how many times a year wash, finally count the number of washed 4 years. The formula is 5 × 20 × 2 × 4 = 800 (times). This result surprised me: light bowl for breakfast at school, my mother washed for me 800 times!