1, I'm in charge today.

Today, my mother gave me 50 yuan to buy fruits and vegetables. I bought a bag of apples, 6 yuan money, a catty of cucumbers, a catty of 2 yuan, a catty of shrimp 28 yuan and a bag of strawberries and 5 yuan. The salesman asked me how much it was. I listed in my mind: 5062285=4 1 (yuan), and quickly said that I want 4 1 yuan. The salesman then asked, "How much do I give you?" I said I would get my 9 yuan money back.

Step 2 take the bus

Today, we learn "riding" in math class. By learning the mixed calculation of addition and subtraction, I know that when the addition is in front of the formula, the addition is calculated first and the subtraction is calculated first. When calculating, the same numbers should be aligned, starting with addition and subtraction. I want to add carry and subtract borrow. I like math class best.

Step 3 buy stationery

My mother gave me 100 yuan to buy school supplies on Sunday. I happily took the money to the supermarket and bought an eraser 2 yuan, a schoolbag 32 yuan, a pencil box 5 yuan, a pen 12 yuan and a bundle of pencils 10 yuan. The cashier asked me to calculate how much it would cost. I remember the calculation method of continuous reduction in school mathematics class.

4. My piggy bank

My piggy bank is a lovely cat with a lot of hard food in its belly. I want to use this money to buy school supplies. My mother praised my idea and said: children who don't spend money indiscriminately from childhood are good children! My heart is full of joy.