Estimating
The estimate of 303 x 3
900
(300 x 3)
201 x 2
402
2 x 1,108
Large pool equipment sets cost $1,042. Small pool equipment sets cost $907.
How much does it cost to buy 3 large pool equipment sets?
$3,126
Estimate of 507 x 6
3,000
(500 x 6)
303 x 3
909
4 x 6,037
24,148
Large pool equipment sets cost $1,042. Small pool equipment sets cost $907.
How much more does it cost to buy 2 large pool equipment sets than 2 small pool equipment sets?
1,200
(400 x 3)
709 x 5
3,545
8,504 x 3
25,512
Diller Elementary is collecting money to donate to a charity. $103 is collected each month. How much money is collected in 9 months?
$927
Estimate of 2 x 1,108
2,000
(2 x 1,000)
904 x 9
6 x 6,007
36,042
Which expression doesn't belong?
4,006 x 5
3,015 x 2
2,010 x 3
1,206 x 5
4,006 x 5 doesn't belong because it's product is not 6,030.
Estimate of 5 x 9,082
45,000
(5 x 9,000)
6 x 108
648
8,009 x 7
56,063
Why do the products of multi-digit numbers with zeros and one-digit numbers sometimes have zeros in them and sometimes have no zeros in them?
When the one-digit number is multiplied by zero, the product is zero. However, sometimes there are regrouped numbers that need to be added to the product of zero.