Activities for 4.NBT.B

Lunar New Year 2026

The 2026 Lunar New Year falls on Tuesday, February 17. In this updated activity, students will explore the unique naming system of the Lunar New Year, which combines...

Number Sense Holidays and Annual Events Grades 4–7

Mental math tricks - part 2

36 x 25 = 900 480 x 25 =12,000 924 x 2.5 = 2,310 Can you see any tricks for doing these calculations in your head? An editable...

Algebra Number Sense Grades 5–HS

Impress your parents at dinner

This activity is the first in our series on mental math tricks. Let your students develop their own individual way of mentally multiplying by 0.5, 5, 50, 500,...

Algebra Number Sense Grades 5–HS

A gorgeous, glittery card

Uh oh! How do you find the area of a heart? Get your students to help you calculate how many sequins you'll need to order for this class...

Number Sense Geometry Grades 3–8