Which Word Fits? is a free printable Kindergarten English worksheet on telling apart words that differ by one letter, aligned to Common Core standard RF.K.3. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions, 24 of them with different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 20 of 25 · the same problems every time you open this link.
Set 1 has all 25 in a single PDF. 24 of these 25 sets ask different questions — this skill does not have 25 questions to give. The rest reorder them, so no two students have the same paper in front of them.
Which Word Fits?
RF.K.3
NameDate
Choose the word from the box that makes sense.
1.I hit the ball with a ___.
Choose: bat · bit · but
2.A ___ says oink.
Choose: pig · peg · pug
3.The cat ___ on the mat.
Choose: sat · sun · sap
4.I sleep in my ___.
Choose: bed · bad · bud
5.My dog likes to ___ in the mud.
Choose: dig · dug · dog
6.The ___ shines in the sky.
Choose: sun · sin · son
7.The ___ ran up the tree.
Choose: cat · cot · cut
8.I put on my red ___.
Choose: hat · hit · hot
LessonPrint · RF.K.3 · Set 20 · free to copy for classroom use
Answer key — Which Word Fits?
Set 20. Prints on its own sheet.
1.bat
2.pig
3.sat
4.bed
5.dig
6.sun
7.cat
8.hat
Last reviewed 2026-09-05. Aligned to RF.K.3 of the Common Core State Standards for English Language Arts.