Lower Elementary Science 1.9 Time, Money, and Estimating

Method:

Look at the number. If the last digit or the units digit is 5 or more than 5 we add 1 to the number in the tens place and make the units digit 0.

If the last digit or the units digit is less than 5 then make the units digit 0 and keep the tens digit as it is.

Example:
Which would be the best estimate for 108 + 32 = ? Answer: 110 + 30 Directions: Answer the following questions. Also write at least ten examples of your own.

Q 1: The first grade has 11 girls and 9 boys. Two girls were absent on Monday? How many children were present on Monday? 18 20 22

Q 2: Which would be the best estimate for 77 + 32= ? 80 + 40 80 + 30 70 + 40

Q 3: A shelf of the bookcase holds 8 books. It has 3 shelves. How many books will the bookcase hold? 24 8 16

Q 4: James got $7 from his Mom for his birthday and $5 from his grandmother. How much does he have? $7 + $5 = $7 $7 x $5 =

Q 5: Which would be the best estimate for 109 + 38 = ? 110+40 130+50 130+50

Q 6: The month that Thanksgiving is celebrated in the U.S. is July January November October

Q 7: Which number shows less than $5 but more than $3? $5.36 $4.15 $6.37

Q 8: The game started at 3. We are 15 minutes late. What time did we arrive. 5:00 3:15 4:15

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