This grade 1 numbers to 20 worksheet gives 23 problems on counting and numbers to 20, ordered from easy to hard, with a separate answer key.
This worksheet practices counting and numbers to 20 for Grade 1, standard 1.NBT.A.1. Children count objects, read ten frames, and write numerals and number words. They also fill in missing numbers, find one more and one less, and solve short story problems. The easy items come first.
Grade 1 Numbers to 20 Worksheet: problems 1–5
Problem 1: Count the stars
Count the stars. Write how many.
Problem 2: Read the ten frames
Look at the ten frames. Write how many counters.
Problem 3: Write the numeral
Write the numeral for the word fifteen.
Problem 4: Write the number word
Write the number word for 17.
Problem 5: Show nine
Color 9 circles in the ten frame to show 9.
Grade 1 Numbers to 20 Worksheet: problems 6–10
Problem 6: Fill the number boxes
Write the missing numbers.
Problem 7: One more sticker
Mia has 19 stickers. Her friend gives her 1 more. Write how many stickers Mia has now.
Problem 8: One fewer apple
Noah has 12 apples. He eats 1 apple. Write how many apples are left.
Problem 9: Dot on the number line
Write the number where the dot is.
Problem 10: Number after nineteen
Write the number that comes right after 19.
Grade 1 Numbers to 20 Worksheet: problems 11–15
Problem 11: Second ten frame
Look at the ten frames. How many counters are in the second frame? How many counters in all?
Problem 12: Count the counters
Count the counters. Write how many.
Problem 13: Missing numbers 11 to 20
Write the missing numbers: 11, 12, __, 14, 15, __, 17, __, 19, 20.
Problem 14: Before and after
Write the number that comes just before 18. Write the number that comes just after 18.
Problem 15: Fill the number line
Write the missing numbers on the number line.
Grade 1 Numbers to 20 Worksheet: problems 16–20
Problem 16: Show sixteen
Color counters on the two ten frames to show 16. How many counters are in each frame?
Problem 17: Maya's stickers
Maya has 13 stickers. She gets one more sticker. How many stickers does Maya have now?
Problem 18: Priya's crayons
Priya has 16 crayons in a box. She gives one crayon to a friend. How many crayons are in the box now?
Problem 19: Liam's mistake
Liam wants to write sixteen. He writes 61. Write the correct numeral. Which digit should come first?
Problem 20: Ethan counts up
Ethan starts at 9 and counts up. Write the next five numbers he says.
Grade 1 Numbers to 20 Worksheet: problems 21–23
Problem 21: Mei's books
Mei puts 17 books on two shelves. The top shelf is full with 10 books. How many books are on the other shelf?
Problem 22: Noah's balloons
Noah counts 12 balloons. He sees one more balloon and counts it. Then he sees one more balloon and counts that too. What is the last number Noah says?
Problem 23: Up and down
Start at 11. Write the number that is one less. Then write the number that is one more than that number.
How to use this grade 1 numbers to 20 worksheet
Print this grade 1 numbers to 20 worksheet as a PDF, solve every problem on paper, then compare with the answer key.
See every chapter on the Grade 1 math page.