Mental Multiplication
300 x 5
7,693 x 3
23,079
Estimate 6,291 x 5 by rounding 6,291 to the nearest thousand.
6,000 x 5 = 30,000
82,678
16,000
534 x 39
20,826
Estimate 492 x 53 by rounding 492 to the nearest hundred and rounding 53 to the nearest ten.
500 x 50 = 25,000
Find the number that is equal to 42,395 x 3 without calculating the exact product.
a) 127,185
b) 27,185
c) 1,200,200
d) 128,290
a) 127,185
21,000 x 3
63,000
676 x 76
51,376
Mariam estimated the product of 9,294 x 6 to be 54,000. What number did she round 9,294 to?
Mariam rounded 9,294 to 9,000.
9,000 x 6 = 54,000
Use estimation to find which problem is greater.
a) 28 x 671
b) 51 x 32
5 x 299
1,495
3,842 x 28
107,576
Manos estimated the product of 9,294 x 6 to be 55,800. What number did he round 9,294 to?
Manos rounded 9,294 to 9,300.
9,300 x 6 = 54,000 + 1,800 = 55,800
A special Dubai chocolate bar costs $159. A rare Labubu costs 4 times as much as the chocolate bar. Ms. Saba bought 2 chocolate bars and a rare Labubu. How much did she pay in total for the chocolate bars and the Labubu? Write your answer in a sentence and label units.
Ms. Saba spent $954 on the chocolate bars and the Labubu (but she probably should have saved her money instead).
4 x 360
1,440
One waffle machine costs $371. How much do 8 machines cost? Write your answer in a sentence.
Eight machines cost $2,968.
Mica and George both estimated the product of 2,190 x 5.
Mica rounded 2,190 to 2,000. George rounded 2,190 to 2,200.
Whose estimate will be closer to the actual answer?
George's estimate will be closer because his rounded number is closer to the original number.
A zoo receives 1,143 adult visitors and 2,817 child visitors daily. How many visitors will the zoo receive in 12 days? Write your answer in a sentence and label units.
The zoo will receive 47,520 visitors in 12 days.