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 21 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 have ___ toes on my feet.
Choose: ten · tan · tin
2.The ___ shines in the sky.
Choose: sun · sin · son
3.I can ___ fast.
Choose: run · rug · ram
4.The ___ swims in the pond.
Choose: fish · dish · wish
5.The ___ ran up the tree.
Choose: cat · cot · cut
6.I drink from a ___.
Choose: cup · cap · cop
7.I sleep in my ___.
Choose: bed · bad · bud
8.The cat ___ on the mat.
Choose: sat · sun · sap
LessonPrint · RF.K.3 · Set 21 · free to copy for classroom use
Answer key — Which Word Fits?
Set 21. Prints on its own sheet.
1.ten
2.sun
3.run
4.fish
5.cat
6.cup
7.bed
8.sat
Last reviewed 2026-09-05. Aligned to RF.K.3 of the Common Core State Standards for English Language Arts.