SCIENCE
(4) PS Mortimer's Math series. Basic math concepts are competently, if somewhat flatly, introduced in the first five books. The sixth offering, Where Is Mortimer?, covers spatial prepositions including up/down and inside/outside. All feature color photos of a stiff-limbed teddy bear interacting with familiar household objects--counting socks, sorting toys, and making fruit patterns. Simple questions ("How many forks can you count?") encourage reader participation. Glos., ind.

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