G3 Mastering Addition

What is a 4-digit number?

• A number with 4 digits
• A number with 3 digits
• A number with 5 digits
• A number with 2 digits

How do we add 4-digit numbers without regrouping?

• Align the numbers by place value and add each column
• Add the ones, then the tens, then the hundreds, and finally the thousands
• Subtract the ones, then the tens, then the hundreds, and finally the thousands
• Multiply the ones, then the tens, then the hundreds, and finally the thousands

What is regrouping in addition?

What do we do when we need to regroup?

• Add the column, write down the ones, carry over the tens
• Subtract the column, write down the ones, carry over the tens
• Multiply the column, write down the ones, carry over the tens
• Divide the column, write down the ones, carry over the tens

Can you explain where we needed to regroup in the problem 4567 + 1987?

What are the key steps to solve word problems?

• Read carefully, identify numbers and what you need to find out
• Guess the answer, write down random numbers, and hope for the best
• Ignore the problem and move on to the next question
• Ask a friend for the answer

What are the important numbers in the word problem: A library has 3,456 books. They buy 1,234 more. How many books are there now?

What do bar models help us do?

• Visualize math problems
• Solve word problems
• Draw pictures of numbers
• Skip the math work

What is the sum of 2,222 + 3,333?

• 5,555
• 5,5555

What is the first step when adding big numbers?

• Start from the ones and move to the left
• Start from the thousands and move to the right
• Start from the tens and move to the left
• Start from the hundreds and move to the right