Mental Math
Estimating
Multiplication
Problem
Solving
Review
100
Evaluate 4 x 30
What is 120
100
Explain the rules of estimation.
What is if the place value behind the underlined digit is 5 or higher, the number rounds up to the next number. If the digit is 4 or below, it stays the same.
100
Solve 149 x 5
What is 745.
100
Identify the property below: 7 x 1 = 7
What is identity property of multiplication.
100
What place value is the 4 in 657.964
What is the thousandths.
200
Evaluate 40 x 50
What is 2,000
200
Estimate 14 x 22.
What is 10 x 20, which is 200.
200
Evaluate 893 x 62
What is 55,366
200
Identify the properties below. 3 x 6 x 5 = (5 x 6) x 3 3 x 6 x 5 = 5 x 6 x 3 For an extra 100 points!, why did I drop the "y" and add an ies instead of keeping it a ys.
What is the Associative Property of Multiplication and what is the Identity Property of Multiplication.
200
What place value is the 3 in 432,986,097.012
What is the ten thousands.
300
Use the Distribute Property to solve. 4 x ( 70 + 6)
What is (4 x 70 ) + ( 4 x 6 ) 280 + 24
300
Estimate 14 x 22 using compatible numbers.
What is 15 x 20, which is 300.
300
Evaluate for 542 x 14
What is 7,588.
300
Mr. Gray bought 26 boxes of crayons. Each box had 12 crayons. How many crayons did Mr. Gray buy?
What is 26 x 12, which is 312.
300
Solve for 4.5 + 6.02 + 3
What is 13.52.
400
Use the Distribute Property to solve. 9 x 63
What is 9 x (60 + 3) (9 x 60) + (9 x 3) 540 + 27
400
Estimate to find the difference of 5.21 - 3.49
What is 1.7 or 2
400
DAILY DOUBLE Explain why there is always a zero added on to the second row in multiplication. For example in 7 x 45
What is the second digit is a ten so it needs a place holder zero.
400
Kerry is collecting money for school. Her goal is to collect $200. She has collected $15 each from 12 people so far. How much more does she need to reach her goal?
What is $20.
400
Compare the following decimals. Are they <, >, or = 2.57800 2.5780
What is =
500
Explain the pattern of multiplication by zeros. For example, 4 x 2 = 8 4 x 20 = 80 4 x 200 = 8,000
What is that as the factor increases by ten, so does the answer.
500
Explain how when you round you can know whether the estimate is larger or smaller than the rounded answer. Consider the problems below: 48 x 17 52 x 12
What is if both numbers rounded up, then the estimate is larger than the actual answer. If both numbers rounded down, then the estimate is less than the actual answer.
500
Solve for 451 x 218
What is 98,318.
500
Janie set up chairs for a presentation. Each row contained 12 chairs and she set up 18 rows. How many chairs were set up?
What is 216 chairs.
500
Order the decimals from least to greatest. 6.024; 6.125; 6.028; 6.2
What is 6.024, 6.028, 6.125, 6.2
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