Multiply by tens
Estimating Products
Area Models/Partial Products
Regrouping
Multi-step word problems
100
30 X 20
What is 600
100
24 x 36
What is 20 x 30 = 600
100
What does it mean when we say" break apart the number" when we are dealing with partial products? Example 27
20 7
100
24 X 13
24 x13 _____ 62 +240 302
100
Roxanne planted a tree that needs sun and water for 5 weeks to become rooted. If they get sun for 8 hours a day, how many hours will it take 1 tree to become rooted?
56 x 5= 280 hours
200
60 x 10
What is 600
200
39 X 41
What is 40 x 40 =1,600
200
Why do we break apart the factors when multiplying partial products?
It makes our factors easier to work with.
200
92 X 54$
$ 4968
200
Vincenzo eats 5 slices of pizza at his party. Each slice of pizza has 300 calories. If Vincenzo eats 2 more slices how many calories will he eat all together?
2,100 calories
300
12 X 40
What is 480
300
The Bunker family has 27 light bulbs in their home. They each use 28 watts of electric to produce light. About how many watts are used if the the Bunker family turns on all the lights?
What is 30 x 30= 900
300
use your white board...... 17 x 39, use the partial product method to solve
30 x 10=300 30 x 7 =210 9 x 10= 90 9 x 7= 63 300+210+90+63= 663
300
72 X 40= 2,880 Is this answer Reasonable? Why? or why not?
Yes Because 70 X 40= 2,800. So 2,880 would be a reasonable answer
300
Our school ordered 25 cases baseballs for the upcoming season. Each case has a dozen balls in it. When the delivery truck came, The man accidentally delivered 2 extra cases. How many baseball did the school have for the season?
25 x 12= 300 300 + 24= 324 baseballs for the season
400
D'Brickashaw earns 24$ per day washing cars. How much will he earn in 30 days
What is $720
400
The cost to ride the train to work is 18$ per month. Joseph takes the train to work for 3 years straight. About how much did it cost Joseph to ride the train?
What is 20 X 40= 800
400
32 x 12 Solve using partial products
30 x 10= 300 30 x 2= 60 30 x 2= 60 10 x 2= 20 300+60+60+20=440
400
68 X 53= 1,124 Is this answer reasonable? Why or why not?
This answer is not reasonable because 70 x 50= 3,500 which is much more than 1,124.
400
Jimmy plays his xbox for 3 hours a day. His friend, Randy plays xbox for 2 hours a day. If Randy and Jimmy play every day except for Sunday. How many hours a week, will Randy and Jimmy play x box all together?
3 x 6= 18 2 X 6= 12 18 +12 30 Hours a week
500
Wyatt jogs 10 miles a week, about how many miles will Wyatt jog in 1 year?
What is 520 miles
500
What key word or words in a math word problem, help us to know that we need to round or estimate?
What is " About" or "reasonableness"
500
135 X 23
What is 100 x 20= 2000 20 x 30 = 600 20 x 5 = 100 3 x 100 = 300 3 x 30= 90 3 x 5 = 15 2000 600 100 300 90 +15 ______ 4,005
500
What is the most important step when multiplying using regrouping?
Putting the zero in the ones place, after the first step.
500
A farmer planted 29 rows of apple trees. There are 27 trees in each row. Unfortunately, 4 rows of apple trees died in a bad rain storm. How many apple trees survived the storm?
29 x 27= 783 4 x 27= 108 783- 108= 675 675 apple trees survived the storm
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