ESTIMATING SUMS AND DIFFERENCES
Round 4 068 to the nearest hundred
What is 4100?
1.42 + 26.47
Whole numbers that can be multiplied together to get another whole number
What are factors?
3 x 400 = ??
What is 1200?
305 000 / 1000 = ??
What is 305?
Karen's local library holds a BBQ every July to kick off the summer. Last year’s attendance was 1032. This year’s attendance was 1903. Estimate how many more people attended this year’s BBQ.
I know that this year had more attendees (1903) than last year (1032). When I see the words “how many more”, I know to use subtraction. I will round to the nearest tens -> 1030 - 1900=870
WHAT IS 870 MORE PEOPLE?
100.75 - 7.4 = ?
What is 93.35?
20 / ?? = 5
What is 4?
50 x 700 = ??
What is 35 000?
How many $100 bills would you get if you exchanged $420 000?
What is 4200 bills?
Colleen buys a loaf of bread for $2.49 and eggs for $5.99. Approximately, how much change will she get if she gives the cashier a $10 bill?
Approx total cost: $2.50 + $6 = $8.50
Change: $10 − $8.50 = $1.50
57.8 - 18 = ?
What is 39.8?
A number that has only two different factors: 1 and itself
What is a prime number?
A bank has received a stack of $20 dollar bills. The stack contains 500 bills. How much money does this stack contain?
20 x 500 = 10 000
650 / 38 =??
What is 17 R4?
Tomas spent $4.49 on lunch, $2.99 on a drink and $9.99 for parking. Approx. how much did he spend in total?
$5 + $3 + $10 = 18
365 - 12.4 = ?
What is 352.6?
8 is a _________ number.
What is a composite number?
18 x 12 = ??
What is 216?
7441 / 35 = ??
You are given $35 to buy groceries. You need to get the following items:
Spinach - $0.99 / Onions $1.99 / Rice $2.50 / Milk $8.99 / Cheese $3.50 / Eggs $5.99 / Chicken $6.50 / Bread $2.49
Can you add Skittles ($1.29) to your groceries?
$32.95 + $1.29 = $34.24
781 015.1 - ?? = 781 002.4
What is 781 002.4?
Express 24 as a product of only prime numbers.
What is 2 x 2 x 2 x 3?
213 x 31 = ??
What is 6603?
876 / 55 = ??
What is 16?