Counting and Number Worksheet Pack (Aquarium Themed) | KS1 Printable Math Worksheets

Ten aquarium-themed counting and number activities that build KS1 children from counting objects and skip-counting through to reading and writing two-digit numbers in words.

What's inside:

• Count the Aquarium – children count sea creatures across four tanks and compare totals, building foundational counting and simple addition
• Count Along the Tank – children fill missing numbers in sequences up to 100, reinforcing number order
• Count in 2s – skip-counting in 2s, including a picture-based counting section and reasoning questions about sequences
• Count in 5s – skip-counting in 5s with grouped picture counting and a "check the keeper's counting" reasoning question
• Count in 10s – skip-counting in 10s, grouped counting, and a true/false-style reasoning question
• Aquarium Number Detectives – ten statements about number order (before/after/between) that children judge as correct or incorrect, correcting any mistakes
• Missing Numbers in the Aquarium – three-part activity filling number sequences, finding a number from clues, and a final "aquarium challenge"
• Write the Number in Words – children convert two-digit numbers into words, including from a number board
• Number Words to Digits – children convert number words into digits, plus ordering the greatest and smallest from a keeper's numbers
• Ultimate Aquarium Number Challenge – a final challenge covering counting, sequences, number words, and reasoning about correctness

Why parents & teachers love this pack:
Covering counting, skip-counting, number order, and number words in one bundle, this pack builds a rounded sense of number for KS1 children — not just reciting a sequence, but reasoning about whether a count or comparison is actually correct.

Includes: 10 printable pages + full answer key
Format: Digital download (PDF) — no physical item will be shipped