Grade 1 · Math · Unit

Doubles, Three Addends, and Addition Pyramids

8 lessonsabout 5 weeks

The unit ends with three more days: a review day, the unit check, and a day to act on what the check showed.

Unit 2 of 8 in the Grade 1 Math Scope and Sequence

What's included in this unit

8 lessons in teaching order, each with its objective and a teacher note
29 practice pages to print, with an easier and a harder page where available
4 classroom tools for the projector
5 activities and pages that children do on a screen
7 check-up pages to collect

The whole unit in one file

Print every page of the unit at once, with the teacher guide first. The guide has one page per lesson: the objective, what to hand out, and the teacher note.

Teacher guide only (PDF)

The unit file, the teacher guide, and saved pages are included with the Teacher plan.

Your PDF is built in your browser, so it always has the newest version of every page.

Lessons

Lesson 1

Doubles and halves

Children double a group of pictures and split an even group into two equal halves, writing the numbers.

StandardCommon Core 1.OA.C.6Operations and Algebraic Thinking

3 class days

Day 1Teach: The Doubling Mirror · Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Easier page, Harder page) · Practice on screen · Check-up page
Day 3Reteach and extend: Act on the check-up pages: reteach the children who are not there yet, with the tool and a new page from the maker; the others take a harder page.

Lesson 2

Near doubles

Children find a sum such as 6 + 7 by using a double and one more (6 + 6 + 1), with sums within 20.

StandardCommon Core 1.OA.C.6Operations and Algebraic Thinking
Prepares forCommon Core 2.OA.B.2Operations and Algebraic Thinking

2 class days

Day 1Teach: The Doubling Mirror · Practice on paper (Core page)
Day 2Practice: Practice on paper (Harder page)

Warm up and teach

Open The Doubling Mirror on the projector.

Practice on paper

Near Doubles
Core page Harder page

Make more

Make more pages like this with the Doubles & Halves maker.

Lesson 3

Make ten to add

Children add a number to 6, 7, 8, or 9 by jumping to ten first and then jumping the rest on a number line, and write the steps, such as 8 + 5 = 8 + 2 + 3 = 13.

StandardCommon Core 1.OA.C.6Operations and Algebraic Thinking
Prepares forCommon Core 2.OA.B.2Operations and Algebraic Thinking

3 class days

Day 1Teach: Rekenrek · Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Harder page) · Practice on screen · Check-up page
Day 3Reteach and extend: Act on the check-up pages: reteach the children who are not there yet, with the tool and a new page from the maker; the others take a harder page.

Warm up and teach

Open Rekenrek on the projector.

Practice on paper

Jump to the Ten First
Core page Harder page

Practice on screen

Lily's Ten Stones — Make a Ten to Add & Subtract

Check-up page

One more page of Jump to the Ten First to collect at the end of the lesson.

Make more

Make more pages like this with the Number Lines maker.

Lesson 4

Think addition to subtract

Children subtract from numbers 11 to 18 by finding the unknown addend, for example solving 13 − 8 by asking 8 + ? = 13.

StandardCommon Core 1.OA.B.4Operations and Algebraic Thinking

2 class days

Day 1Teach: Number Balance · Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Easier page, Harder page) · Check-up page

Warm up and teach

Open Number Balance on the projector.

Practice on paper

Think Addition to Subtract
Core page Easier page Harder page

Check-up page

One more page of Think Addition to Subtract to collect at the end of the lesson.

Teacher note

Common mistakes: Children count back by ones from 13 and lose track, or they do not see that 13 − 8 and 8 + ? = 13 ask for the same number. Some write one number in the subtraction and another in the addition; a frequent one is adding the two numbers they see in 8 + □ = 13 and writing 21 in the box.
Words to use: Point to the number bond: "13 is the whole. 8 is one part. What is the other part?" Say: "I don't have to count back. I can ask: 8 and how many more make 13?" Count up through ten: "8 and 2 make 10, and 3 more make 13. 2 and 3 make 5." Then read all three: "8 + 5 = 13, so 13 − 8 = 5."
What to watch for: Watch who counts back and who counts up from the part. Check that the same number is written in all three places on a card. The easier page has wholes to 10: use it for children who still need to learn what the number bond shows. The harder page has no number bond. On the number balance, put 13 on one side and 8 on the other and ask: "What must we add to the 8 side to make it level?" Add 5: 8 + 5 = 13, so 13 − 8 = 5.

Lesson 5

True or false?

Children decide whether an addition or subtraction equation within 20 is true or false, including equations that begin with the single number, such as 16 = 13 + 3.

StandardCommon Core 1.OA.D.7Operations and Algebraic Thinking

3 class days

Day 1Teach: Number Balance · Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Easier page, Harder page) · Check-up page
Day 3Reteach and extend: Act on the check-up pages: reteach the children who are not there yet, with the tool and a new page from the maker; the others take a harder page.

Warm up and teach

Open Number Balance on the projector.

Practice on paper

True or False?
Core page Easier page Harder page

Check-up page

One more page of True or False? to collect at the end of the lesson.

Make more

Make more pages like this with the Addition & Subtraction maker.

Lesson 6

Odd and even numbers

Children count a group in pairs or share it between two friends, and say whether the number is odd or even.

Later gradeCommon Core 2.OA.C.3Operations and Algebraic Thinking

3 class days

Day 1Teach: The Pair Gate · Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Easier page, Harder page) · Practice on screen · Check-up page
Day 3Reteach and extend: Act on the check-up pages: reteach the children who are not there yet, with the tool and a new page from the maker; the others take a harder page.

Warm up and teach

Open The Pair Gate on the projector.

Practice on paper

Odd or Even? Count the Pictures in Pairs
Core page Easier page Harder page
Can Two Friends Share Fairly?
Core page Easier page Harder page

Practice on screen

Even or Odd?

Check-up page

One more page of Odd or Even? Count the Pictures in Pairs to collect at the end of the lesson.

Make more

Make more pages like this with the Odd & Even maker.

Lesson 7

Add three groups

Children add three groups of pictures and write the total, adding an easy pair first.

StandardCommon Core 1.OA.B.3Operations and Algebraic Thinking
Prepares forCommon Core 1.OA.A.2Operations and Algebraic Thinking

2 class days

Day 1Teach: Practice on paper (Core page)
Day 2Practice and check: More pages from the maker · Practice on screen · Check-up page

Practice on paper

Add Three Groups
Core page

Practice on screen

Add Three Numbers — Three-Part Number Bond

Check-up page

One more page of Add Three Groups to collect at the end of the lesson.

Make more

Make more pages like this with the Addition & Subtraction maker.

Lesson 8

Addition pyramids (number walls)

Children fill a number wall in which each brick is the sum of the two bricks under it, and find a missing bottom brick.

StandardCommon Core 1.OA.C.6Operations and Algebraic Thinking
StandardCommon Core 1.OA.D.8Operations and Algebraic Thinking

2 class days

Day 1Teach: Practice on paper (Core page)
Day 2Practice and check: Practice on paper (Easier page, Harder page) · Practice on screen · Check-up page

Practice on paper

Number Walls to 10
Core page Easier page Harder page
Number Walls: Find the Missing Brick
Core page Easier page Harder page

Practice on screen

Number Walls to 10 (a page that checks the answers)

Check-up page

One more page of Number Walls to 10 to collect at the end of the lesson.

Make more

Make more pages like this with the Logic Puzzles maker.

Unit check: before and after

Two short paper checks made from this unit's own worksheets. Give Check A before you teach the unit and Check B after it, and you can see what changed. Each part belongs to one lesson.

Part 1: Lesson 1, Doubles and halves (2 tasks)
Part 2: Lesson 2, Near doubles (2 tasks)
Part 3: Lesson 3, Make ten to add (1 task)
Part 4: Lesson 4, Think addition to subtract (1 task)
Part 5: Lesson 6, Odd and even numbers (2 tasks)
Part 6: Lesson 7, Add three groups (1 task)
Part 7: Lesson 8, Addition pyramids (number walls) (2 tasks)

Not in the check: Lesson 5. Worksheets that cannot be split into single tasks are left out.

Check A (PDF) · 4 pages Check B (PDF) · 4 pages

Printing a check counts as a download, like any worksheet.

Answer key A Answer key B Teacher pages: points, class record, and what to do next

The answer keys and the teacher pages come with the paid Teacher plan.

This is a classroom check of this unit's lessons. It is not a standardized test, and its points are not a grade.

Unit checks