Multiply by Multiples 10, 100 & 1,000
3 x 70=
210
6 x 112=
About 600
Use Distributive to solve (box method)
5 x 921=
(5 x900) + (5x20) + (5x1) =
4,500 + 100 + 5 = 4,601
227 x 3 =
681
6 x 400=
2,400
4 x 2,610=
About 12,000
Use Distributive to solve (box method)
4 x 352=
(4 x 300) + (4 x 50) + (4 x 2) =
1,200 + 200 + 8 = 1,408
1,165 x 7 =
8,155
8 x 6,000=
48,000
3 x 287=
Round 287 to ____
3 x ______= ______
3 x 300= 900
Use Distributive Property to solve box method
6 x 310=
(300x6) (10x6) (0x6)
1,800 + 60= 1,860
4,826 x 6 =
28,956
7,000 x 4=
28,000
5 x 1,240 = 9,200
Is this reasonable?
Round 1,240 to ______.
5 x _____= _______.
5 x 1,000= 5,000
9,200 is not reasonable.
Use Distributive Property to solve box method
4 x 1,554 = _________
(1,000x4) (500x4) (50x4) (4x4)
4,000 +2,000 + 200 + 16 = 6,216
2,459 x 7 =
17,213
The Mississippi River is about 8 times the length of the Hudson River. If the Hudson River is about 300 miles long, about how many miles is the Missippi River?
8 x 300= m
m= 2,400
About 2,400 miles
Elle estimates the product of 211 and 6 is 1,800. Is this estimate reasonable? Explain.
No.
211 should be rounded to 200 and then multiplied by 6 to get 1,200.
200 x 6= 1,200
A lodge at a state park has 49 rooms. Up to 5 people can stay in each room. What is the maximum number of people who can at stay the lodge at one time? Use the box method
______ toes?
245 people
Tommy spent $259 on 4 computers each. Use standard algorithm to find out how much money Tommy spent in total.
$1,036