## Arithmetic Senser: Foundations

Very young children are sensitive to combining or separating perceptual groups. An infant may observe, point, or make sounds while someone else introduces a quantity of objects. They will notice the effects of increasing or decreasing small collections by one item and may also be sensitive to the results of combining larger groups.

### Other Examples:

• An infant, shown two groups of 5 dots hidden behind a screen one at a time, acts more surprised and interested when the screen is taken away to show only five dots (an incorrect amount) than if it is removed to reveal ten dots (a correct amount).
• An infant reacts to demonstrations of addition and subtraction that use objects and manipulatives by alternating visual tracking during operational steps performed by a caregiver (i.e., showing two puppets, hiding one, pointing to the remaining puppet, waving hands in the air).
• An infant babbles and coos, showing interest in watching different quantity arrangements.
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