There are many books with stories and pictures that shows sets of items, buying items, measures, and so on that can be used to pose problems or activate students' knowledge and encourage them to invent their own problems. A well known book that can be used in this context is The Doorbell Rang by Pat Hutchins (1986). You can check that one out if you are interested. Here are some other suggestions:
Hannah's Collection by: Jocelyn (2000)
This is a colourful book , by Canadian author Jocelyn, highlights the fun and skills that makes collecting enjoyable. This book can be used as a good jumping off point for students to share their own collections or to model the character's collections. The focus is on sorting and grouping objects within a collection or between collections can provide opportunities for adding, subtracting or grouping objects for introducing multiplication.
One Hundred Hungry Ants by: Pinczes (1999)
This book is written by a grandmother for her grandchild and helps students explore multiplication and division. 100 ants are on a trip to a picnic and try to speed up their travel time by moving from a single file line to two rows of 50, four rows of 25 and so on. The story uses arrays to explore different ways of grouping the 100 ants. It is a great introduction for students to explore grouping and using an array.
Hope these resources can serve as interesting hook activities in your future 3 part math lessons.
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