Decimal Number Sense
Write two examples of decimals that are in between 4.2 and 4.3.
Examples:
4.25
4.2999
4.21
4.6 + 2.35
6.95
2.3 * 5
11.5
$7.50 is shared equally amongst 5 friends. How much would each friend get?
$1.50 per friend
Jane wants to earn the most money by selling lemonade for the prices below. To earn the greatest amount of profit, what two prices should she choose and what is the sum?
$8.19. $6.91 $7.44 $6.88 $9.22
$ 8.19. &. $9.22
Total: $17.41
Write the decimal that represents 4 ones, 2 hundredths, and 7 tenths. Also, write this value in expanded form.
4.72
4 + .7 + .02 (share other ways)
10 - 4.68
5.32
.25 * .8 =
.2
7.5 divided by 3?
Check quotient using multiplication
2.5
Which two decimal values would multiply together to create the largest/greatest product? What would a reasonable estimate for product be (round to estimate)?
7.5 12.2 8.9 5.7 3.8 4.75
12.2 * 8.9
12 * 9 = 108
12 * 10 = 120
Is 6.2 - 3.9 closer 1, 2, or 3? How can you explain and justify your reasoning?
2
6-4 = 2 (round down and up to get to closest values)
Which two decimal values have the smallest difference? Prove this by completing a subtraction problem or a number line using these values.
4.56 3.5 5.15 2.79 6.23
4.56 ---------- 5.15 (.59)
.44 + .15 = .59
Is .48 * 6 closest to 2, 3 or 4? What is your reasoning? Check in finding the exact product.
Closest to 3 (rounded .5 * 6 = 3)
Exact calculations is 2.88
4.86 ÷ 0.6=
8.1
Solve 4.2 * 1.6 and determine the product. Draw an area model (box method) to check to make sure multiplication of decimals is accurate.
6.72
Put these in order from least to greatest:
2.45, 2.405, 2.5, 2.40
2.40, 2.405, 2.45, 2.5
A rope is 12.6 meters long. You cut off 4.85 meters. How much of the rope is left/remaining?
7.75 meters
A roll of ribbon costs $1.85 per yard. How much would 3.6 yards cost?
$6.66 in total
Solve using order of operations:
8.4 ÷ (0.7×2)
6
What is the rule and what comes next in the decimal sequence?
73.8 , 72.6, 71.4, 70.2
The rule is subtracting 1.2 from the decimal value.
Next in the sequence is 69.
Which is closest to 5?
4.82, 5.07, or 4.91
How can you prove or justify your thinking?
5.07,
This is only 7 hundredths more than 5, 4.91 is 9 hundredths away from 5 and 4.82 is even further away.
Liam ran 3.45 miles on Monday, 2.8 miles on Tuesday, and some more miles on Wednesday. If he ran a total of 8.5 miles in all, how much did he run on Wednesday?
2.25 miles
Create a decimal multiplication problem whose product is between 5 and 6.
Many answer choices---have class check to make sure it works!
7.245 ÷ 1.5 =
4.83
What is the rule and what comes next in the decimal sequence?
2.7 , 8.1 , 24.3, 72.9, ...
Sequence is multiplying the decimal value by 3. Next in the sequence is 218.7