📘 arithmetic

1. The problem is to find the missing number in the subtraction equation $$\_ - 514 = 253$$. 2. We use the subtraction property: If $$a - b = c$$, then $$a = b + c$$.

1. **State the problem:** Calculate the sum of 1 and 1. 2. **Formula used:** Addition of two numbers is given by $a + b$.

1. The problem is to calculate the product of 9 and 1000. 2. The formula for multiplication is $a \times b = c$, where $a$ and $b$ are numbers and $c$ is their product.

1. **State the problem:** We need to find the result of dividing 20000 by 480. 2. **Formula used:** Division is represented as $$\frac{a}{b}$$ where $a$ is the numerator and $b$ is

1. **State the problem:** Calculate the value of the expression $$(20 \times 5000) + (10 \times 10000) + (6 \times 2500)$$. 2. **Apply multiplication:** Multiply each pair of numbe

1. The problem is to perform the addition of two numbers. 2. The formula for addition is simply $a + b = c$, where $a$ and $b$ are the numbers to add, and $c$ is the sum.

1. The number of tigerfish is counted as 11 (||||/ ||||/ | means 5 + 5 + 1 = 11). 2. The number of pufferfish is counted as 8 (||||/ ||| means 5 + 3 = 8).

1. The problem is to explain the division of 18 by 5. 2. Division is the process of splitting a number into equal parts. Here, we want to find how many times 5 fits into 18.

1. The problem is to find the result of dividing 18 by 5. 2. The division formula is $\text{Dividend} \div \text{Divisor} = \text{Quotient}$.

1. **State the problem:** We need to calculate $20 \div \frac{5}{7}$ and simplify the answer. 2. **Recall the rule for division of fractions:** Dividing by a fraction is the same a

1. **State the problem:** We need to calculate $3 \div \frac{1}{5}$ and express the answer in its simplest form. 2. **Recall the rule for division by a fraction:** Dividing by a fr

1. **State the problem:** Calculate the value of $4 - 2 \frac{5}{9}$. 2. **Convert mixed number to improper fraction:** $2 \frac{5}{9} = \frac{2 \times 9 + 5}{9} = \frac{18 + 5}{9}

1. **State the problem:** Calculate the sum of 2 and 2. 2. **Formula used:** Addition of two numbers is given by $a + b$.

1. The problem is to find the sum of 3 and 10. 2. The formula for addition is $a + b = c$, where $a$ and $b$ are the numbers to add, and $c$ is the result.

1. **State the problem:** Calculate the sum of 1 and 1. 2. **Formula used:** Addition of two numbers is given by $a + b$.

1. **State the problem:** We need to divide 94 by 23. 2. **Formula used:** Division is the operation of finding how many times one number is contained within another. Here, we calc

1. The problem is to find the sum of the given numbers: 2244.00, 1610.45, 23686.06, 4430.06, 269.14, 935.00, 935.00, 935.00, 935.00, 935.00, 269.04, 333.84, 715.20, 4566.11, 666.10

1. **State the problem:** Calculate the sum of 1 and 2. 2. **Formula used:** Addition of two numbers is given by $a + b$.

1. The problem involves understanding the value of beads in a place value system where upper beads have a value of 5 and lower beads have a value of 1. 2. The total value in a plac

1. **State the problem:** Multiply 25824 by 89 step by step. 2. **Formula used:** Multiplication of two numbers can be done using the distributive property: $$a \times b = a \times

1. 题目要求将除法算式转换成小数和分数形式。 2. 除法转小数的规则是：$a \div b = \frac{a}{b}$，然后计算小数值。