By Topic
Number System
Counting, place value, and comparing numbers — from numbers up to 20 in Kindergarten all the way to integers, rational numbers, and real numbers in Grade 8.
8 grades covered
12 chapters
20 lessons
Grades K–8
Kindergarten — Number System
Numbers to 20Go to chapter →
1
Compare Numbers to 20
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Grade 1 — Number System
Joy of NumbersGo to chapter →
1
Compare Numbers up to 19
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Mental MathGo to chapter →
1
Add and Subtract 1 from a number
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Magic with More NumbersGo to chapter →
1
Count, Read, and Write Numbers up to 120
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More About More NumbersGo to chapter →
1
Compare Numbers up to 99
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2
Order Numbers up to 99
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Grade 3 — Number System
Number SystemGo to chapter →
1
Read and Write 4-Digit Numbers
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2
Write 4-Digit Numbers in Sequence
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3
Understand Place Value of 4-Digit Numbers
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4
Compare and Order 4-Digit Numbers
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Grade 4 — Number System
Number SystemGo to chapter →
1
Compare and Order Numbers up to 6 digits
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2
Round Multi-Digit Numbers
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Grade 5 — Number System
Order of OperationsGo to chapter →
1
Simplify Expressions with Parentheses
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Grade 6 — Number System
Rational NumbersGo to chapter →
1
Compare and Order Rational Numbers
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Grade 7 — Number System
Rational NumbersGo to chapter →
1
Add and Subtract Rational Numbers
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2
Multiply and Divide Rational Numbers
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Grade 8 — Number System
Real Numbers and the Pythagorean TheoremGo to chapter →
1
Rational Numbers
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2
Irrational Numbers
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