More learning in sound and light today. We spent lots of time in the dark today!
We learned that light travels in a straight line. We also learned that light can be stopped (ABSORBED) by some materials. I.e. the bat symbol
We also learned that light can reflect off shiny surfaces and pass through some surfaces.
We used prisms to learn that light is made up of many colours!
Over the last little while in math we have been working on multiplication. We first worked on strategies for multiplying single digits by single digits (e.g. 7×9). Last week, we worked a lot on various strategies for multiplying a 2-digit number by a 1-digit number (e.g. 34 x 6).
Many students today have not mastered memorizing multiplication facts, so until they do, they need some strategies to help.
We learned about many strategies including, but not limited to:
Multiplying is really repeated addition (3×6 is 6+6+6)
Multiplying is skip counting (6, 12, 18)
Stacking (what most of our moms and dads do when multiplying)
Decomposing (34 can be 30 AND 4)
Friendly TENS numbers (take away the zero, add the zero when multiplying by numbers like 40)
NEAR friendly numbers (e.g. when multiplying 39 x 7, do 40 x 7, then subtract one group of 7)
Doubling (if multiplying by 4, you can multiply by 2 first, then double it)
Finger trick for multiplying by 9
Today we began talking about division. We looked at this picture first to help us understand WHAT division is and how it is connected to multiplication.
You can help your child at home by practicing their multiplication facts until they know them by heart.
Also, help them see that division is about equal groups. We have 20 pieces of potato for dinner. If we give each of our 4 family members an equal amount, how many pieces will each person get?
On Friday we experimented with making sound and tried to answer the following four questions:
1) How is sound produced?
2) How are low and high sounds made?
3) How does the shape and material of an object affect the sound it produces?
4) In what ways does sound affect our life?
At the end of the unit, we will revisit these questions.
Here’s what our room sounded like. YIKES!!!
Today we learned that sound is vibrations and that you can hear, feel, and even, see sound!
We learned new vocabulary such as vocal cords, sound waves, and molecules.