Addition to 1,000 by counting, with hundreds and tens

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Students learn to add numbers up to 1,000 by counting with hundreds and tens.

2.NBT.B.7

Discuss with students that it is important to be able to add to 1,000 so you can determine large amounts.

Show some addition problems on the interactive whiteboard and ask students to solve for the totals. Ask them to write their totals on a sheet of paper, and to hold up their answers so you can check their work. Erase the grey boxes on the interactive whiteboard to show the answers.

Tell students that they can add by counting amounts. You first count the first addend, how many you already have. Then you add the second addend, or how much more is being added. When you add them together, you get the total. Show this on the interactive whiteboard with the blocks and money. Check that students are able to do this by having them count the blocks together. Ask which addition problem they are solving. Next, say that you can add the addition problems in different ways. Say that you can use a number line. You can also add the second addend in parts. First add the hundreds, and then the tens, and end with the ones. Or you count the hundreds, tens and ones of both addends together, and add those totals. You can also add everything in one big jump in your head. Emphasize that you must carefully look at each addition problem to decide which of these methods would work best for that particular addition problem. Ask students to solve a few addition problems. Ask them how they solved the problems. Finally ask students to solve a story problem. Ask students to determine what kind of math problem is being told, which numbers are needed to solve the math problem, and to solve for the answer. Ask students to solve another story problem.

Check that students are able to add to 1,000 by counting with hundreds or tens by asking the following questions:

- How do you calculate 460+200?

- How do you calculate 710+240?

Students first practice adding two addends with visual support. Then they are asked to solve without visual support and then are given a story problem to solve.

Discuss with students that it is important to be able to add to 1,000 so you can do large addition problems and can find the totals of large numbers. Check that students know how to solve addition problems up to 1,000 by giving a story problem on the interactive whiteboard. Two students are shown saying which numbers are needed for the addition problem and the class must determine which student is correct. Ask them to explain how they know which student is correct.

Students who have difficulty adding to 1,000 can make use of the number line as support. Show the students that they can add in multiple ways and that they can choose how big of jumps to take on the number line. They can also make use of a sheet of scratch paper to jot down intermediate sums.

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