Grade Level: 1st Skill: Addition and Subtraction Topic: Addition Facts to 20 Goal: Know the addition facts (sums to 20) and the corresponding subtraction facts and commit them to memory. Skill Description: Your child will memorize all the addition facts that add up to the sum of 20. Additionally, your child will memorize the corresponding subtraction facts that descend from 20.

### Sample Problems

 (1) 2 + 3 = (2) 5 – 2 = (3) 8 + 9 = (4) 17 – 8 = (5) 5 + 5 =

### Learning Tips

 (1) Flash cards – Rote memorization of math of addition and subtraction facts to 20 will improve the speed with which your child learns these facts. Keep a set in the car and have him/her read them to you as you drive. Also, you can use travel time to verbally quiz your child on these math facts. (2) White board practice – Using a white board and color markers, practice these math facts with your child. Oftentimes, just using different tools to engage your child in the learning process will help him/her feel excited about learning these skills. (3) Use manipulatives – When practicing math facts, use any type of manipulative which will allow your child to visually and kinesthetically (touching) gain understanding of the concepts of addition (adding to) and subtraction (taking away). If you are able to purchase math manipulatives at an educational store, great! If not, there are plenty of manipulatives you can use at home: popsicle sticks, rocks, marbles, rice (uncooked), beans, paperclips, crayons, etc. (4) Create word problems together – Use everyday experiences to create word problems which will further internalize these skills for your child. For example, you say, “There were two birds sitting on the fence. Two more come. How many birds are now sitting on the fence?” You can practice word problems orally or in writing. Once your child gains an understanding of them, have him/her give you word problems. Every once in a while, answer incorrectly to see if you child will catch your mistake. (5) When doing addition and subtraction problems together, ask your child to write out the problem using pictures, tally marks, shapes, or any other item he/she would like to draw. Drawing and visually observing the adding or subtracting of objects will assist your child in learning these concepts.

### Online Resources

 (1) (2) (3) (4) (5)

### Extra Help Problems

 (1) 6 + 5 = (2) 11 – 6 = (3) 12 – 4 = (4) 8 + 4 = (5) 9 – 1 = (6) 8 + 1 = (7) 20 – 2 = (8) 18 + 2 = (9) 18 – 9 = (10) 9 + 9 = (11) There are two squirrels in the tree. One runs away. How many squirrels are left in the tree? (12) One cat is playing in the grass. Two more cats join her. How many cats are playing in the grass? (13) Four frogs are sitting on a log. Two jump away. How many frogs are left on the log? (14) If you have five marbles, and your friend takes away one, how many marbles do you have left? (15) Fifteen ladybugs are eating leaves. Two more ladybugs join them. How many ladybugs are eating leaves? (16) Ten children are playing in the pool. Six leave to eat a snack. How many children are left playing in the pool? (17) Twenty red ants are marching down the tree. Three fall off. How many red ants are marching down the tree? (18) If I have one dollar and you give me two more, how many dollars will I have? (19) Fourteen honeybees are buzzing around the hive. Nine fly away. How many bees are buzzing around the hive? (20) 7 + 7 = (21) 14 – 7 = (22) 10 + 10 = (23) 20 – 10 = (24) 3 + 3 = 6 (25) 6 – 3 =