2nd Grade Fluency Within 20, Even and Odd Numbers Worksheet Solutions (PDF)
This fluency even odd answers for 2nd Grade covers fluency within 20, even and odd numbers (Common Core 2.OA.B.2, 2.OA.C.3), with a free PDF to print.
Every problem is worked step by step with the strategy shown. Check each answer, then fix any mistakes by re-reading the strategy in the lesson.
Grade 2 · Common Core State Standards: 2.OA.B.2, 2.OA.C.3
Fluency even odd answers: exercises 1 to 10
Exercise 1 – Count on
Start at 8 and hop 3 times: 9, 10, 11.
\(8 + 3 = 11\). 11
Exercise 2 – Fill the ten frame
Move 3 dots from the 6 to the 7. Now the first frame is full: \(7 + 3 = 10\). The second frame has 3 dots left: \(10 + 3 = 13\).
13
Exercise 3 – Doubles fact
Eight and eight is a doubles fact. \(8 + 8 = 16\). 16
Exercise 4 – Near doubles
\(7 + 7 = 14\). Since 8 is one more than 7, add 1: \(14 + 1 = 15\). 15
Exercise 5 – Break apart to ten
Give 1 from the 5 to the 9. That makes 10, and 4 is left. \(9 + 5 = 10 + 4\). 4 (the sum is 14)
Exercise 6 – Think addition
\(5 + 8 = 13\), so \(13 – 5 = 8\). 8
Exercise 7 – Subtract from sixteen
From 9, count up to 16. 9 to 10 is 1. 10 to 16 is 6. \(1 + 6 = 7\). Check: \(9 + 7 = 16\). 7
Exercise 8 – Missing addend
Subtract the known part: \(15 – 8 = 7\).
\(8 + 7 = 15\). 7
Exercise 9 – Fact family
\(6 + 9 = 15\), \(9 + 6 = 15\), \(15 – 6 = 9\), and \(15 – 9 = 6\).
Four facts: 6 + 9 = 15, 9 + 6 = 15, 15 – 6 = 9, 15 – 9 = 6
Exercise 10 – Pairs of dots
Make pairs. There are 5 pairs and 1 dot left over.
11 is odd.
Exercises 11 and up
Exercise 11 – Pick the even numbers
Even numbers end in 0, 2, 4, 6, or 8. 14 ends in 4. 20 ends in 0. 18 ends in 8.
14, 20, and 18
Exercise 12 – Equal addends
Split 14 into two equal groups: 7 and 7.
\(14 = 7 + 7\). 7 + 7
Exercise 13 – Read the chart
The numbers between 11 and 19 are 12 to 18. The blue squares are even.
12, 14, 16, 18
Exercise 14 – Two equal-addend sentences
\(18 = 9 + 9\) and \(10 = 5 + 5\).
9 + 9 and 5 + 5
Exercise 15 – Subtract with eight
\(8 + 4 = 12\), so \(12 – 8 = 4\). \(8 + 9 = 17\), so \(17 – 8 = 9\).
4 and 9
Exercise 16 – True or false
\(9 + 8 = 17\) is true. \(15 – 6 = 9\), not 8, so the second sentence is false.
True, false
Exercise 17 – Pinecones
Move 1 dot to fill the ten frame: \(9 + 1 = 10\). Then \(10 + 7 = 17\).
Maya has 17 pinecones.
Exercise 18 – Sticker swap
Think addition: \(9 + ? = 17\). \(9 + 8 = 17\).
Jamal has 8 stickers.
Exercise 19 – Ladybug pairs
Make pairs. There are 7 pairs and 1 ladybug left over.
No. 15 is odd, so one ladybug has no partner.
Exercise 20 – Sharing cups
Split 16 into two equal groups. \(8 + 8 = 16\).
Each child gets 8 cups. 8 + 8 = 16
Exercise 21 – Tulip bed
\(6 + 6 = 12\). Then \(12 + 1 = 13\).
13 ends in 3, so it is odd.
13 tulips; odd
Exercise 22 – Crayon box
Step 1: \(18 – 9 = 9\).
Step 2: \(9 + 4 = 13\).
Noah has 13 crayons.
Key facts behind this fluency even odd answers
- Doubles add a number to itself: \(8 + 8 = 16\).
- Make a ten by moving dots to fill a ten frame, then add the rest.
- Subtraction is a missing addend: \(15 – 8\) asks \(8 + ? = 15\).
- Even numbers end in 0, 2, 4, 6, or 8. Odd numbers end in 1, 3, 5, 7, or 9.
- Every even number up to 20 is a sum of two equal addends.
How to use this fluency even odd answers
Cover each solution, solve the exercise again, then uncover it and compare every line. If your answer differs, find the first step that changed and redo the exercise from there.
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All Grade 2 chapters: Grade 2 math.
