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shortest
(page 371)
side
(page 415)
skip-count
(page 241)
slide
(page 435)
Use one finger to move it.
sort
(page 3)
sphere
(page 409)
square
(page 411)
subtract
(page 103)
subtraction sentence
(page 55)
sum
(page 71)
Add to find the sum.
survey
(page 5)asking questions to collect data
symmetry
(page 437)
Fold it and both halves match.
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