Add To Favorites
Sometimes you just need an extra pair of hands to help you solve a challenging calculation, especially when you are learning how to add and subtract! Add on and take away fingers as you practice arithmetic strategies.
Learning addition by adding on can be a challenge when students add on beyond ten. Here’s an extra pair of hands to the rescue! Extra hands can also help when teaching children how to subtract by adding up to a landmark number (a number that is simple to work with, like 10, 20, 30, etc.) and then adding up to the target number from the landmark number.
Students work together to trace their hands on a dry erase board using Crayola Dry-Erase Crayons. Most students can trace their non-dominant hand by themselves, but may need assistance from a partner to trace the other hand. Give children a minute or two to exercise their creative spirits by adding fingernails, skin creases, rings and bandages. Trace your own hands on a large dry-erase board so you can demonstrate strategies for students.
Strategies to demonstrate may include:
Add On Beyond Ten: Make 6 fingers with your real hands, add on seven more using the rest of your fingers plus 3 more with your extra pair of hands.
Subtraction: Erase fingers as you compute subtraction problems with a minuend larger than 10.
What’s the Difference? Compare amounts by computing the difference between 2 numbers. “Your hands show 3. The extra pair of hands shows 10. What’s the difference?” Show children how to match finger for finger then count the extra fingers to find the difference.
Explore Tens and Ones: Have some children create extra pairs of hands showing 10 fingers and others showing numbers less than ten. Sort by those that show tens and those that show ones. Count by tens. Add up all the ones. Group ones to form tens.
Landmarks and Targets: When subtracting across a ten (such as 12-7), demonstrate how to add on to the subtrahend (7) to get up to a landmark number (10) using your real fingers, then add on to the landmark number to get to the target number (12).
Explore how Lane Smith’s illustrations contribute to the mood created by the words of Jon Scieszka in their book, The Ma
Add To Favorites
Engage your students in deep understanding of ratio & proportion without them even knowing! Use the children’s book “Chu
Watch a garden of Fibonacci flowers spring to life in the classroom as students discover a mathematical pattern in natur
Introduce, or refresh, the concept of surface area to your students with an investigation into the Joel Shapiro “Untitle
Students create and share valuable pictures with coin rubbings.
Picasso’s art career spanned many decades and included a variety of styles and influences. Create a portrait collage ins
Investigate and experience the fun of M. C. Escher’s tessellating shapes. Students create their own tessellating shapes
Hidden images magically appear from within a grid of geometric shapes when students use contrasting colors to define the