Add and Subtract Within 20, Timed Practice A

For timed practice, set a timer for 3 minutes and treat the count as a personal best to beat, not a grade. On the review page, ask your child to say why the named strategy fits the numbers.

Beat the clock with 3 minutes of add and subtract facts within 20 (set A). To add is to join groups. To subtract is to take away. Fast facts help you solve bigger problems. The directions on the page read: Set a timer for 3 minutes. Then, solve as many facts as you can before time is up. The page opens with a worked example, and the answer key shows every answer.

Yes, both. We made it for 2nd Grade addition, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with mixed addition and subtraction facts. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Set a timer for 3 minutes and have the student solve as many facts as they can. Use the sheet to see progress over time, not as a grade, and compare today's count with last week's.

Naming the strategy makes students use it on purpose, so they can compare which strategies feel fastest for them.

Start timed sheets once a child can solve facts within 20 without counting on fingers. If counting is still needed, work on the strategy sheets first so speed does not replace understanding.

They support 2.OA.B.2 (add and subtract within 20, and know sums of two one-digit numbers from memory).

Second graders should fluently add within 20 (CCSS 2.OA.B.2) and add within 100 using strategies based on place value and properties of operations (2.NBT.B.5). They also begin adding within 1,000 using models and drawings (2.NBT.B.7).

Regrouping (carrying) is typically introduced mid-year in second grade when students add two-digit numbers that sum to more than 9 in the ones place. Understanding place value is a prerequisite. Use base-ten block worksheets before transitioning to the standard algorithm.

By the end of second grade, students should know all addition facts within 20 from memory (CCSS 2.OA.B.2). That is 100 facts (0+0 through 9+9, plus the commutative pairs). Daily timed practice with addition fact worksheets helps build automaticity.