Grade 2 · Number
Number Concepts to 100
Numbers to 100 require genuine place value understanding, not just symbol recognition. 49 is not just a symbol: it is 4 tens and 9 ones, and this structure is what makes arithmetic efficient. Students who truly understand place value can add 48 + 30 mentally by adding the tens (48 + 30 = 78) rather than counting by ones. Even and odd numbers reveal a fundamental pattern in the counting sequence that will reappear in multiplication, fractions, and algebra.
LESSON VIDEO
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Lesson video
A short walkthrough to play in class or assign for flipped/at-home viewing.
WHAT STUDENTS WILL LEARN
✓Count forward and backward by 2s, 5s, and 10s from various starting points
✓Compare and order numbers to 100 using benchmarks of 25, 50, and 100
✓Understand place value: a two-digit number has tens and ones (e.g., 49 = 4 tens and 9 ones)
✓Decompose two-digit numbers into tens and ones in multiple ways
✓Identify even and odd numbers and describe the pattern
✓Describe quantities using personal referents and cultural contexts (e.g., seating at a feast)
BUILDS ON