Number Ninjas

Number Ninjas — 10 No-Prep Maths Challenge Sheets for Infants (K–2)

Level 1 of the Infants Maths Challenge Series

Looking for a maths activity your capable K–2 students can actually sink their teeth into — without any extra preparation from you?

Number Ninjas is a set of 10 ready-to-use maths challenge sheets designed for high potential and capable students in Kindergarten, Year 1, and Year 2. Each sheet covers a different mathematical concept and is designed to stretch early learners beyond the basics — with open-ended questions, problem-solving tasks, and extension challenges built right in.

Designed to be used flexibly: Number Ninjas sheets are designed to be glued into the left-hand side of an exercise book, with students showing all working out on the right-hand side. This simple format encourages students to record their thinking, not just their answers — a habit that builds strong mathematical reasoning from the earliest years.

What’s inside: Each of the 10 challenge sheets covers a different area of the mathematics curriculum:

• 🔢 Number Ninjas #1 — Place value, ordering numbers, number before and after
• ➕ Number Ninjas #2 — Addition, subtraction, missing numbers, doubles and halves
• ✖️ Number Ninjas #3 — Multiplication, arrays, sharing and division
• 🔄 Number Ninjas #4 — Patterns, algebra, missing numbers
• 🍕 Number Ninjas #5 — Fractions — halves and quarters
• 📏 Number Ninjas #6 — Measurement, length, perimeter, area
• 🕐 Number Ninjas #7 — Time — clocks, duration, calendars
• 💰 Number Ninjas #8 — Money — coins, change, problem solving
• 🔷 Number Ninjas #9 — 2D and 3D shapes, symmetry
• 📊 Number Ninjas #10 — Data, chance, and probability

Every sheet includes:

• Graduated questions from accessible to challenging
• Open-ended problems with multiple possible solutions
• At least one genuine extension challenge for your most capable students
• A complete answer key for teacher reference

Use Number Ninjas as:

• A fast finisher activity — always ready, no prep required
• A weekly challenge task for your extension group
• A homework activity for capable students
• A rotation task during maths sessions
• A take-home challenge for students who want more

Level 1 of the Infants Maths Challenge Series: Number Ninjas is the entry point of the Infants Maths Challenge Series — accessible for capable K–2 students while still providing genuine challenge. For students ready for more, Maths Missions (Level 2) offers a greater level of complexity and depth across the same year levels.

Whether you use them weekly, as fast finisher tasks, or as take-home challenges — Number Ninjas gives your capable early learners something worth thinking about.

Answers included. Print and go. No prep required.