Mental Math Adding and Subtracting
Description: CCSS.Math.Content.2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Tags: CCSS.Math.Content.2.OA.B.2, 2nd grade math, Addition, Subtraction
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Officer Jenny helped 8 people today, and Officer Bob helped 7 people. How many people did they help in total?
There were 15 donuts at the police station. Officer John ate 5. How many donuts are left?
Officer Amy found 6 lost dogs and Officer Tim found 9 lost cats. How many lost animals did they find together?
There are 18 police cars in the station. 8 cars went out on duty. How many cars are left in the station?
Officer Mary saw 12 balloons in the park. She found 7 more balloons later. How many balloons did she see in total?
Officer Peter has written up 11 car accidents today. He wrote up 7 yesterday. How many accidents has he written up this week so far?
Officer Jenny helped Officer Tim solve 3 cases. Then, they solved 5 more cases together. How many cases did they solve in total?
The police station had 19 complaints in the morning. Officer Michelle worked on 6 complaints. How many are left?
Officer Bob and Officer Steve caught 4 robbers in the morning. They caught 7 more robbers in the evening. How many robbers did they catch in total?
Officer Smith has 9 police badges. He gave 4 badges to the new agents. How many badges does he have left?
