Sums & Differences
Front-end Estimation with Adjustment
Multiplication
Division
Animal Planet
100
Rounding to the nearest thousand: 6,521 + 5,079
7,000 + 5,000 = 12,000
100
Use front-end estimation with adjustment to estimate each sum. 4,261 + 7,879
4,000 + 7,000 = 11,000 200 + 800 = 1,000 11,000 + 1,000 = 12,000
100
Estimate the product: 6,327 x 7
6,000 x 7 = 42,000
100
Estimate the quotient: 2,786 / 5
3,000 / 5 = 600
100
This African mammal kills more people annually than lions, crocodiles and snakes.
What is a hippopotamus
200
Rounding to the nearest thousand: 65,773 - 65,439
66,000 - 65,000 = 1,000
200
Use front-end estimation with adjustment to estimate each sum. 2,619 + 7,391
3,000 + 7,000 = 10,000 600 + 300 = 900 10,000 + 900 = 10,900
200
Estimate the product: 2,145 x 7
2,000 x 7 = 14,000
200
Estimate the quotient: 6,507 / 7
7,000 / 7 = 1,000 OR 6,300 / 7 = 900
200
Punxsutawney Phil has a 39% accuracy rating when predicting the next six weeks of weather on February 2.
What is a groundhog
300
Rounding to the nearest thousand: 4,837 - 2,152
5,000 - 2,000 = 3,000
300
Use front-end estimation with adjustment to estimate each sum. 5,559 + 6,041
5,000 + 6,000 = 11,000 500 + 0 = 500 11,000 +0 = 11,500
300
Estimate the product: 8,756 x 6
9,000 x 6 = 54,000
300
Estimate the quotient: 5,512 / 6
6,000 / 6 = 1,000 OR 5,400 / 6 = 900
300
The only species of bird that is able to fly backward.
What is a hummingbird
400
Rounding to the nearest thousand: 9,810 + 6,290
10,000 + 6,000 = 16,000
400
Use front-end estimation with adjustment to estimate each sum. 3,497 + 7,198 + 8,253
3,000 + 7,000 + 8,000 = 18,000 400 + 100 + 200 = 700 18,000 + 700 = 18,700
400
Estimate the product: 7,120 x 5
7,000 x 5 = 35,000
400
Estimate the quotient: 2,785 / 3
3,000 / 3 = 1,000 OR 2,700 = 900
400
On average, this little critter's heart beats 300 times per minute.
What is a hedgehog
500
Rounding to the nearest thousand: 452,369 - 423,896
452,000 - 424,000 = 28,000
500
Use front-end estimation with adjustment to estimate each sum. 1,864 + 5,907 + 9,501 + 8,253
1,000 + 5,000 + 9,000 + 8,000 = 23,000 800 + 900 + 500 + 200 = 2,400 23,000 + 2,400 = 25,400
500
Estimate the product: 5,559 x 3
6,000 x 3 = 18,000
500
Estimate the quotient: 6,287 / 8
6,400 / 8 = 800
500
About one in every four million is born with a rare genetic deficit that turns it blue. One in every thirty million is turned yellow.
What is a lobster
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