### 1. Add and subtract within 20.

Children in 2nd grade should be able to add and subtract numbers within 20, including mentally adding and subtracting 10. They should also be able to solve addition and subtraction word problems.

### 2. Understand place value up to the hundreds place.

In 2nd grade, children should be able to understand place value up to the hundreds place. This includes understanding what each digit in a number represents, as well as reading and writing numbers in standard form.

### 3. Write numbers in standard form.

In 2nd grade, children should be able to write all numbers in standard form, which is a way of writing numbers using only digits 0-9 and grouping them by threes. So for example, the number 123 would be written as 1, 2, 3.

### 4. Compare two numbers using greater than, less than or equal to symbols.

In 2nd grade, children should be able to compare two numbers using greater than, less than or equal symbols. This means they should be able to tell which of two numbers is bigger, smaller or the same size.

### 5. Find 10 more or 10 less than a number.

In 2nd grade, children should be able to find 10 more or 10 less than any number. They can do this by counting up or down from the number until they get to 10.

### 6. Round numbers to the nearest 10 or 100.

In 2nd grade, children should be able to round numbers to the nearest 10 or 100. This means they should be able to tell what the number would be if it were rounded up or down to the next 10 or 100.

### 7. Identify and explain simple fractions.

In 2nd grade, children should be able to identify and explain simple fractions. A fraction is a part of a whole, and children in 2nd grade should be able to identify fractions like 1/2, 1/3, 1/4, etc. They should also be able to explain what these fractions represent.

### 8. Convert between fractions, decimals and percentages.

In 2nd grade, children should be able to convert between fractions, decimals and percentages. This means they should be able to change a fraction like 1/2 into a decimal like 0.5 or into a percentage like 50%.

### 9. Calculate money amounts, including tips and discounts.

In 2nd grade, children should be able to calculate money amounts, including tips and discounts. This means they should be able to figure out how much money they would have after a given tip or discount.

### 10. Solve word problems involving addition, subtraction, multiplication and division.

In 2nd grade, children should be able to solve word problems involving addition, subtraction, multiplication and division. This means they should be able to read a word problem, figure out what operation to use, and solve it.