This grade 1 numbers worksheet answer key solves all 23 problems of the counting and numbers to 20 worksheet step by step.
Check each answer with this key. Every problem shows the counting steps, so children can see how the answer was found. Count again with the child if an answer is different.
Grade 1 Numbers Worksheet Answer Key: problems 1–5
Problem 1: Count the stars
Touch each star one time. The last number said is 8.
There are 8 stars.
Problem 2: Read the ten frames
The first frame is full. It has 10. The second frame has 2 more.
The ten frames show 12.
Problem 3: Write the numeral
The word fifteen is written with the digits 1 and 5.
The numeral is 15.
Problem 4: Write the number word
Seventeen ends in teen.
The word is seventeen.
Problem 5: Show nine
Fill the top row of 5 spaces. Then fill 4 spaces in the bottom row.
There are 9 colored circles.
Grade 1 Numbers Worksheet Answer Key: problems 6–10
Problem 6: Fill the number boxes
Count up: 3, 4, 5, 6, 7.
The missing numbers are 5 and 7.
Problem 7: One more sticker
Count up from 19. The next number is 20.
Mia has 20 stickers.
Problem 8: One fewer apple
Count back one step from 12. You say 11.
Noah has 11 apples left.
Problem 9: Dot on the number line
Count the steps from 0 to the dot. The dot is on 6.
The dot is at 6.
Problem 10: Number after nineteen
Count: 18, 19, then the next number.
The number after 19 is 20.
Grade 1 Numbers Worksheet Answer Key: problems 11–15
Problem 11: Second ten frame
The second frame has 3 counters. The first frame is full with 10.
The second frame has 3 counters. In all there are 13.
Problem 12: Count the counters
Move each counter into a ten frame as you count. You fill one frame and 5 more go in the next.
There are 15 counters.
Problem 13: Missing numbers 11 to 20
Count in order from 11 to 20: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.
The missing numbers are 13, 16, and 18.
Problem 14: Before and after
Just before 18 is 17. Just after 18 is 19.
The numbers are 17 and 19.
Problem 15: Fill the number line
Count along the line: 8, 9, 10, 11, 12, 13, 14, 15, 16.
The missing numbers are 10 and 13.
Grade 1 Numbers Worksheet Answer Key: problems 16–20
Problem 16: Show sixteen
Fill the first frame with 10 counters. Put the other 6 counters in the second frame.
The first frame has 10 counters. The second frame has 6 counters.
Problem 17: Maya's stickers
One more than 13 is the next number when counting up: 14.
Maya has 14 stickers.
Problem 18: Priya's crayons
One less than 16 is the number just before 16: 15.
There are 15 crayons in the box.
Problem 19: Liam's mistake
Sixteen is 1 and then 6. Liam wrote the digits in the wrong order.
The correct numeral is 16. The digit 1 comes first.
Problem 20: Ethan counts up
After 9 comes 10, then 11, 12, 13, and 14.
The next five numbers are 10, 11, 12, 13, 14.
Grade 1 Numbers Worksheet Answer Key: problems 21–23
Problem 21: Mei's books
17 is one full ten frame and some more. After 10 books, count on: 11, 12, 13, 14, 15, 16, 17. That is 7 more numbers.
There are 7 books on the other shelf.
Problem 22: Noah's balloons
After 12 comes 13. After 13 comes 14.
The last number is 14.
Problem 23: Up and down
One less than 11 is 10. One more than 10 is 11.
The numbers are 10 and 11.
How to use this grade 1 numbers worksheet answer key
Read this grade 1 numbers worksheet answer key after trying each problem yourself, and redo any problem you missed.
Printable PDF · Worksheet Answer Key
Grade 1 Counting and Numbers to 20 worksheet answer key
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