Addition Using Mental Strategies
Alex has 3 pennies. Then he gets 7 more pennies. How many pennies does Alex have now?
3 + 7 = 10.
Alex has 10 pennies now.
Jackie checks out 11 books from a library. She reads 7 of the books. How many books does Jackie have left to read?
11 - 7 = 4
Jackie has 4 books left to read.
There are 4 bananas and 9 apples in a fruit bowl. How many pieces of fruit are in the bowl?
4 + 9 = 13
10 + 3 = 13
There are 13 pieces of fruit in the bowl.
There are 5 green apples and 6 red apples in a basket. How many apples are in the basket?
5 + 6 = 11.
There are 11 apples in the basket.
Weston has 16 marbles in a jar. He takes 8 marbles out to play. How many marbles are in the jar now?
16 - 8 = 8
There are 8 marbles left in the jar now.
There are 4 windows in a room. There are 7 windows in another room. How many windows are in both rooms?
4 + 7 = 11
10 + 1 = 11
There are 11 windows total.
Connie has 4 books. She buys 2 more books at the bookstore. How many books does Connie have now?
4 + 2 = 6
Connie now has 6 books.
Bart finds 9 shells on the beach. He gives 4 shells to a friend. How many shells does Bart have now?
9 - 4 = 5
Bart has 5 shells now.
Sam stacks 8 blocks. Then he adds 7 more blocks to the stack. How many blocks does Sam have stacked now?
8 + 7 = 15
10 + 5 = 15
There are 15 blocks in the stack now.
Sam painted 3 pictures. Eli painted twice as many pictures as Sam. How many pictures did they paint?
Sam painted 3 pictures.
Eli painted 6 pictures.
They painted 9 pictures total.
There are 10 cows in a field. 3 of the cows are brown. The rest of the cows are black and white. How many cows are black and white?
10 - 3 = 7
There are 7 black and white cows in the field.
17 - 9 = 8
8 more bees need to go in the hive.