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On the Move: Mass Migrations
1.
Three urchins are on a rock. If there are 6 rocks, each with 3 urchins, how many urchins are there?
15
18
21
2.
10 hermit crabs crawl along the beach. If a wave catches 3 and sweeps them away, how many are left on the sand?
6
7
13
3.
Six Carolina wrens each lay 5 eggs in their nests. How many eggs are there?
30
35
11
4.
Four elf owls perch on their cactus. If one flies off to hunt, how many are left?
5
4
3
5.
An octopus has 8 legs. If there are 2 octopi on the page, how many legs are there in all?
16
12
8
6.
7 woodpecker finches each eat 4 worms. How many worms have been eaten?
28
21
14
7.
2 rhinos stomp across the savanna. Each rhino has 4 legs. How many legs are there in all?
4
6
8
8.
Five hundred termites build a mound. If three hundred leave to form a new colony, how many are left?
100
200
300
9.
Four bromiliads grow on a branch. If three tadpoles swim in each bromiliad, how many tadpoles are there?
7
12
15
10.
Four elephants munch on leaves. If eight more join, how many are in the herd?
10
12
32
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