# All Lessons

### Subtract Numbers by Counting Down

This operations and algebraic thinking lesson covers subtracting numbers by counting down. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students read the subtraction problem and then subtract the numbers by counting down. A number chart is provided to keep them on track. Word problems are also used. They finish by reading the fact family aloud.

### Determine if Equations are True or False

From CCSS "For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2."

### Add Three Numbers

Retrofit the existing lesson of adding three numbers to include word problem applications.

### Count and Write Numbers to 120

This number and operations in base ten lesson covers how to count and write numbers to 120. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students will read the numbers in a number chart and write in missing numbers.

### Count and Write Numbers to 50

This number and operations in base ten lesson covers how to count and write numbers to 50. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students will read the numbers in a number chart and write in missing numbers.

### Count Objects 100-120

This number and operations in base ten lesson covers how to count objects from 100 to 120. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students will read sentences that describe a specific number of objects in a group. Then, they will count on from that total to add a certain number more.

### Count Objects 20-100

This number and operations in base ten lesson covers how to count objects from 20 to 100. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students will read sentences that describe a specific number of objects in a group. Then, they will count on from that total to add a certain number more.

### Identify the Place & Value of Digits in a Number

This number and operations in base ten lesson covers how to identify the place and value of digits in a number. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students are asked to identify a certain digit in a two-digit number, identify the place of that digit, and then circle the name of that place, and write the value of the digit in numerals.

### Rewrite Numbers

1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

1.NBT.2.A1.NBT.2.A 10 can be thought of as a bundle of ten ones — called a "ten."

1.NBT.2.B1.NBT.2.B The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

1.NBT.2.C1.NBT.2.C The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

This number and operations in base ten lesson covers how to rewrite numbers. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students are asked to read the number, represent it in dots if needed, and group the dots into groups of ten. Then, they rewrite the number and interpret it in words.

### Compare Two-Digit Numbers Using Symbols

This number and operations in base ten lesson covers how to compare two-digit numbers using symbols. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students are asked to compare each digit of a pair of two-digit numbers, starting at the highest place value. Then, they identify which number is less than, greater than, or equal to, and write the correct symbol.

### Determine Ten More or Ten Less Than a Number

This number sense lesson focuses on identifying ten more or ten less than a number. The lesson includes research-based strategies and questions that help prepare students for assessments. In this lesson, students read the problem and identify the bold number. Then, they count ten numbers up to find ten more, or count ten numbers down to find ten less. In addition to the lesson, there are six pages of Independent Practice and review with questions modeled after current adaptive testing items.

### Compare Two Numbers (No Symbols)

This number sense lesson focuses on comparing two numbers. The lesson includes research-based strategies and questions that help prepare students for assessments. In this lesson, students identify two numbers on a number chart. Then, they identify which number is smaller and which number is bigger. In addition to the lesson, there are four pages of Independent Practice and review with questions modeled after current adaptive testing items.

### Count by Fives

This number sense lesson focuses on counting by fives. The lesson includes research-based strategies and questions that help prepare students for assessments. In this lesson, students use a chart to help count by fives and fill in the missing numbers. Then, students read the missing number pattern three times. In addition to the lesson, there are 11 pages of Independent Practice and review flashcards with questions modeled after current adaptive testing items.

### Count By Twos

This number sense lesson focuses on counting by twos. The lesson includes research-based strategies and questions that help prepare students for assessments. In this lesson, students use a chart to help count by twos and fill in the missing numbers. Then, students read the missing number pattern three times. In addition to the lesson, there are 14 pages of Independent Practice and review flashcards with questions modeled after current adaptive testing items.

### Identify Groups of 10s

1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

1.NBT.2.C1.NBT.2.C The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).