Sara had 8 pencils. Her friend Omar gave her 7 more. How many pencils does Sara have now?, 8+7=15, 8-7=1, Ali saw 9 birds in a tree. Later, 5 more birds came. How many birds are there now?, 9-5=4, 9+5=14, Reem had 15 balloons. 3 balloons flew away. How many balloons does she still have?, 15-3=12, 15+3=18, Nora has 14 apples. Yousef has 6 fewer apples than Nora. How many apples does Yousef have?, 14+6=20, 14-6=8, There were 11 crayons in the box. The teacher took away 9 crayons to share. How many crayons are still in the box?, 11-9=2, 11+9=20.

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