Multiplication
When multiplying a number by 1, the answer is always ____.
that number
When multiplying by multiples of 10 the answer will always end in ___.
0
Does the order of multiplication matter?
No. Like addition, you may multiply in any order.
Sum, total, in all, and combined are key words that tell us we need to ____.
add
Product, times, of, and each are key words that tell us we need to ___.
multiply
When multiplying a number by 5, the answer will always end in __ or __.
0 or 5
Multiplying by a multiple of 10 is the same as...
For example, multiplying 2x40 is the same as multiplying (2 steps, breaking down the multiple of 10)
Think about the number lines we drew.
Multiplying 2x4 and then adding a 0 to the end.
When multiplying by 0 the answer will always be __.
0
Difference, minus, change, have left, decrease, and how much more are key words that tell us we need to ___.
subtract
Quotient, goes into, per, shared evenly, and shared equally are all key words that tell us we need to ____.
divide
If 3x5=15, name 2 other facts in that fact family
5x3=15, 15÷5=3, and 15÷3=5
5x3 is the same as 5 groups of 3 ones.
5x30 is the same as 5 groups of 3 ___. (place value)
Tens.
True or false, when multiplying any number by 2 the number will always be even?
True, try it out.
Mrs. Alyea and Miss Sermersheim played a game. Mrs. Alyea scored 620 points in the first round and 352 points in the second round. Miss Sermersheim scored 871 points in the first round and lost 409 points in the second round. Who won the game and how many points did they score?
Mrs. Alyea (972 points vs 462)
A box of 5 paintbrushes costs $10. How much would it cost to buy 20 paint brushes?
20÷5=4 boxes
4x$10=$40
Multiply 8x7
56
9x5=___
9x50___
45, 450
What property of multiplication is being shown below?
8x20= (4+4)x20
8x20= (4x20)+(4x20)
Distributive. It involves decomposing a factor by breaking it into an addition problem. Remember: Distribute has a t in it and a t looks like a plus sign, standing for addition.
For her birthday, Bella got $145. She spent $73 of it at the store. On Christmas, she got $299. How much money does bella have now?
$145-$73=$72
$72+$299=$371
Riley wants to buy 3 baby yodas that are $10 dollars each. She can save $5 a week. How long will it take her to save enough money to buy them?
3x$10=$30
$30÷5=6 weeks
Multiply 12x3
36
6x80=____
480
What property of multiplication is being shown below?
6x40=6x(4x10)
6x40=(6x4)x10
The associative property of multiplication. Like that of addition, it has to do with the grouping of numbers. It allows you to group the factors in any way.
37+82+24=143 hotdogs.
192-143=49 hotdogs.
Jalonni bought 6 cases of juice today. Tomorrow she will buy three less cases than today. If there are 6 bottles of juice in each case, how many bottles did she buy all together?
6 today and 6-3=3 tomorrow so 6+3=9 cases total.