shell

Everyday

1. A shell is the hard outer cover of a sea animal like a snail, clam or crab; people find shells on beaches. tree →
2. A shell is the hard outside of an egg, a nut, a tortoise or a turtle. tree →
3. A shell is anything like a hard outer case: the shell of a building. tree →
4. To shell nuts or peas is to take them out of their shells. tree →

In the lessons

a thing that is counted in problems («Zoe found 12 shells on the beach»); in science shells protect soft animals (snails, crabs, turtles), and eggs have shells; in everyday life collecting shells at the beach, cracking egg shells, shelling peas

Examples

• Anna had 7 shells and lost 5. tree →
• Zoe found 12 shells on the beach. tree →
• Tom collects 4 shells every day. tree →
• A snail carries its shell on its back. tree →
• Crack the egg and throw away the shell. tree →
• A turtle hides inside its shell when it is scared. tree →
• We shelled peas for dinner. tree →
• Hold a big shell to your ear and listen. tree →
• Crack went the egg-shell, as a waggon passed over it. tree →

Note

The thing being counted; carries no operation clue. Keep counts of shells apart from counts of other things. Trap: «4 shells every day» for some days is equal groups: multiply. Plural «shells».

In Jewish tradition

a thing that is counted in problems («Zoe found 12 shells on the beach»); in science shells protect soft animals (snails, crabs, turtles), and eggs have shells; in everyday life collecting shells at the beach, cracking egg shells, shelling peas

Note

The thing being counted; carries no operation clue. Keep counts of shells apart from counts of other things. Trap: «4 shells every day» for some days is equal groups: multiply. Plural «shells».