Multiply by 10's
88 X 10 =
880
47 X 18=
846
Mary baked 12 batches of cookies. Each batch had 24 cookies. How many did she bake?
228 cookies
What is the SUM of 13 and 21?
34
69 X 20=
1,380
72 X 74 =
5,328
Lara does sit-ups for 44 days in a row. She does 34 sit-ups per day. How many sit-ups does Lara do?
1,496 sit-ups
What is the difference?
419-362 =
57
73 X 90=
6,570
44 X 15 =
660
A school has 20 classrooms. There are 24 students in each classroom. How many students are there in all?
480 students
Find the product.
78 X 9 =
702
43 X 70=
3,010
65 X 46 =
2,990
A jeweler made 19 ruby necklaces. Each necklace has 23 rubies. How many rubies were used in all to make the necklaces.
437 rubies
Find the SUM
91,392 + 87,409 =
178,801
82 X 200=
16,400
75 X 21 =
1,575
If Mrs. Smith has 25 trays of cookies and each tray has 16 cookies on it how many cookies are there in all?
400 cookies
ROUND to the nearest HUNDRED THOUSAND
451,250
500,000