Base Ten
3 x 10
30
Use rounding to estimate
6 × 125
about 600
Draw a model to find 224 × 4.
Show your model
224 x 4 = 896
22 x 9
198
Rudy’s Pizza makes 317 pizzas and 54 subs every day. How many items are made in 3 days?
54 + 314 = 371
371 x 3 = 479 items
8 x 60
480
Use rounding to estimate the product
4 × 2,610
about 12,000
What are the partial products when finding 2,361 × 4?
4x1 = 4
4 x 60 = 240
4x 300 = 1200
4 x 2,000 = 8,000
4+240+1200+8,000 = 9,444
3 x 185
555
Wyatt said he used partial products to write 7 × 870 = 5,600 + 49. Explain Wyatt’s error and use math to justify your explanation.
He did not use place value correctly.
he should have multiplied 7 x 7 tens = 490 not 49
5 × 8,000
40,000
Ellie says the product of 211 and 6 is 1,866. Is this calculation reasonable? Explain.
No, 6 x 211= about 6 x 200 = 1,200. That is not close to 1,866
720 x 6 =
4,320
2,189 × 7
15,323
Mrs. Wallingford sells trading cards in boxes of 30 and in boxes of 60. If she sells 5 boxes of 60 and 6 boxes of 30, how many trading cards did Mrs. Wallingford sell?
480 boxes
Bob said 4 × 500 = 200. Explain his error using place value.
No, 4 x 5 = 20 then place 2 zeros
2,000
A new two-seater car weighs 1,785 pounds. About how much would 8 of the two-seater cars weigh? Choose the best estimate.
about 16,000 pounds
4 x 1,865
7,460
2,239 x 7 =
15,673
Rudy’s Pizza makes 317 pizzas and 54 subs every day. How many items are made in 3 days?
54 + 314 = 371
371 x 3 = 479 items
The Ganobi River is about 7 times the length of the Beecher River. If the Beecher River is about 600 miles long, about many miles long is the Ganobi River? Write and solve an equation.
600 x 7 = m
m= 4,200 miles
Gul can run 800 meters in 139 seconds. About how long would it take her to run 6 times as far if she runs at the same speed?
about 600 seconds
Tod Mountain is a mountain peak near Tyler, Texas. A ranger hiked 607 feet to and from the peak, each way. The ranger hiked 3 times in the past four weeks. How far did the ranger hike on Tod Mountain over the past four weeks?
3,642 feet
6,754 x 6
40,524
Mr. Brouard would like to purchase a laptop computer for each of his 2 daughters and 1 son. The computers each cost $387. Write and solve an equation to find the total cost of the computers. Explain why your answer is reasonable
3 x 387 = 1,161