When we add numbers, we put groups together to find the total, called the sum. In first grade, we practice adding numbers where the total is 20 or less.
Adding numbers up to 20 builds on what you know about sums up to 10. Use what you already know to help solve larger problems.
A teen number can be thought of as 10 and some more. This helps us understand numbers from 11 through 20.
Think of teen numbers as “ten and ones.” For example, 16 is ten and six ones.
Sometimes, we solve addition problems by finding the missing number. This helps us understand number pairs that make a total up to 20.
Remember number pairs to 20: 11+9, 12+8, 13+7, 14+6, 15+5, and so on. These facts will help you solve problems quickly.
We can use real objects, counters, or drawings to help us see how numbers work together and make larger sums.
Use things around you like coins, pencils, or blocks. Drawing pictures also helps make addition easier to understand.
A number line helps us add by starting at one number and hopping forward to add the other number until we reach the total.
Always move to the right when adding. The farther you go, the bigger the number becomes.
We use addition every day when we put groups together or find totals in real situations.
Look around your home or classroom. Group objects and add them to see how numbers combine to make a total up to 20.