Sawyer says that 302 x 6 equals 192. Why is his answer not reasonable?
"302 is more than 192" or "300 x 6 = 1800"
200
10 + 10 + 10 + 10 + 10 + 10 as multiplication
10 x 6
200
3 x 22=
66
200
68 x 7
490
200
100 x 7
700
200
Brian multiplied 42 x 4 using break-apart strategy and got 88. Why is this answer not reasonable?
40 x 4 = 160 and 42 x 4 is greater than 40 x 4 so the answer is greater than 160.
300
40 x 10
400
300
34 x 6=
204
300
Round to estimate 189 x 3
600
300
100 x 90
9000
300
Evan goes whale watching and he sees sixteen Orcas each hour. What would be a reasonable answer to how many he saw in four hours? 40, 60, 80, or 100.
60
400
Fotoula baked 4 batches of cookies. There were 60 cookies in each batch. How many cookies did Fotoula bake altogether?
240
400
If Jaaron does 1 science experiment each week for three years, how many science experiments will Jaaron do altogether?
156
400
Savannah's puppy eats 11 dog biscuits each week. Estimate how many he will eat in 9 weeks.
90
400
If Ava rides her horse Arrow 10 laps around a ring in an hour, how many laps will she do in four hours?
40
400
Alyssa goes to the store to get paints. Each tube of paint cost $1.95. She figured that 8 tubes would cost $15.60. How can you show that this is reasonable?
$2 x 8 = $16. $1.95 is a little less than $2, and $15.60 is a little less than $16.
500
If Ben gets $20 a week for doing chores, and there are 4 weeks in a month, how much does he earn in one month?
$80
500
Ben bought eight video games that cost $56 each. How much did he spend?
$448
500
Emily saves $7 each week. Use rounding to estimate how much she saves in 42 weeks.
$280
500
If Carlo's Pizza makes 100 pizzas each day, how many do they make in 10 days?
1000
500
Marco scores 13 points in each basketball game. He thinks that he scored over 100 points in 9 games. How can you tell if he is right?
Since 12 x 9 = 108, 13 x 9 is greater than that, so 13 x 9 is more than 100, and Marco is right.