Multiplying by 10s
What is 45 × 100?
4,500
Estimate: 198 × 4 by rounding to the nearest hundred.
200 × 4 = 800
In 35 × 10, what place value does the 3 move to?
Hundreds place
A car dealership sells 45 cars each month. About how many cars do they sell in 10 months?
450 cars
What is 120 × 1,000?
120,000
Estimate: 476 × 9
500 × 10 = 5,000
In 56 × 100, how many zeros will the product have?
Two zeros
A farmer plants 36 rows of corn. Each row has 100 corn plants. How many corn plants does he have?
3,600 corn plants
What is the pattern when you multiply a number by 10, 100, or 1,000?
The number shifts left, and we add zeros based on the place value.
True or False: 49 × 7 is about 400
True, because 50 × 8 = 400
What is the value of the digit 4 in 4,560?
4,000
A warehouse has 48 stacks of boxes. Each stack contains 1,000 boxes. How many boxes are in the warehouse?
48,000 boxes
A plane carries 325 passengers on each flight. Estimate how many passengers fly in 30 flights
(300 × 30) ~ 9,000 passengers
Solve: 23 × 400
9,200
Find a close estimate for 68 × 49 using rounding
70 × 50 = 3,500
True or False: 1,230 × 10 is the same as adding a zero to the end
True
A bakery sells 124 muffins each morning. Estimate how many muffins they sell in 8 mornings.
(120 × 8) ~ 960 muffins
The school cafeteria serves 426 meals each day. Estimate how many meals are served in 25 days.
(400 × 25) ~ 10,000 meals