📘 arithmetic

1. 問題陳述：在一個4行5列的長方形網格中，有多少個長方形？ 2. 公式與規則：

1. **State the problem:** Calculate the sum of 4 and 7. 2. **Formula used:** Addition of two numbers is given by $a + b$ where $a$ and $b$ are numbers.

1. The problem is to calculate the value of $\frac{100}{9.58}$. 2. This is a simple division problem where 100 is divided by 9.58.

1. **Problem:** Find the Lowest Common Multiple (LCM) of 3 and 10 using the diagram. 2. **Formula and Concept:** The LCM of two numbers is the smallest positive integer that is div

1. Let's understand the unitary method: it involves finding the value of a single unit and then using it to find the value of multiple units. 2. Suppose you have a problem like: "I

1. The problem appears to involve multiplying 294 by 6 and verifying the result. 2. The multiplication formula is straightforward: $$a \times b = c$$ where $a=294$, $b=6$, and $c$

1. **State the problem:** Darren practices piano 5 days a week, each day for $\frac{3}{4}$ of an hour. We need to find the total hours he practices in a week and express the answer

1. The problem is to verify the subtraction: $19237 - 17850$ and check if it equals $1387$ or $1547$. 2. The subtraction formula is: $$a - b = c$$ where $a = 19237$, $b = 17850$, a

1. The problem is to evaluate the expression $1 + 0f$. 2. In mathematics, the symbol $f$ typically represents a variable or function, but here it appears immediately after a zero w

1. The problem is to subtract the mixed numbers $2\frac{2}{25}$ and $1\frac{1}{3}$.\n\n2. First, convert the mixed numbers to improper fractions.\n\nFor $2\frac{2}{25}$: $$2\frac{2

1. The problem is to understand the number 4 and its properties. 2. The number 4 is a positive integer and an even number.

1. **State the problem:** We need to calculate the value of $\frac{2.5}{0.012}$. 2. **Formula and rules:** Division of decimals can be simplified by multiplying numerator and denom

1. **State the problem:** We need to subtract mixed numbers in the following expressions: - $5 \frac{1}{3} - 2 \frac{2}{3}$

1. The problem is to find the sum of 0.006 and 9.683. 2. The formula for addition is straightforward: $$a + b = \text{sum}$$ where $a = 0.006$ and $b = 9.683$.

1. **Problem Statement:** Multiply decimals mentally by 0.1, 0.01, and 0.001. 2. **Key Concept:** Multiplying a decimal by 0.1, 0.01, or 0.001 shifts the decimal point to the left

1. The problem is to convert a given number to a whole number. 2. Whole numbers are non-negative integers: 0, 1, 2, 3, ...

1. **State the problem:** We want to evaluate the number 127.143 step by step using place value. 2. **Understand place values:** Each digit in a decimal number has a place value de

1. The problem is to evaluate the number 127.143 using a table method. 2. Typically, a table method breaks down the number into parts for easier understanding or calculation.

1. **State the problem:** MRS Duval makes 1 litre of ice cream. She eats $\frac{1}{8}$ litre and her children eat $\frac{3}{5}$ litre. We need to find the fraction of a litre of ic

1. The problem asks to determine whether the answer is 9 or 10 for both cases. 2. Since the question is ambiguous, let's consider two possible interpretations: the number 9 and the

1. The problem is to understand the number 90533.20 and verify its correctness or meaning. 2. This is a decimal number with five digits before the decimal point and two digits afte