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Round to the nearest 100.
What number is missing?
What is the answer?
What shape am I?
Do you know your multiplication facts?
100

1,234

1,200

100

15, 23, 31, ___, 47

39

100

145 + 345 + 789 =

1, 279

100

I am perfectly round

circle

100

9 x 8 = 

72

200

156

200

200

123, 129, ___, 141

135

200

456 + 897 + 789 = 

2,142

200

I have four even sides.

Square

200

9 x 9 = 

81

300

3,567

3,600

300

46, 49, 52, 55, ___, 61

58

300

4,000 + 2,000 = 

6,000

300

I have three sides and three corners. 

triangle
300

7 x 7 = 

49

400

467

500

400

15, 24, ___, 42, 51

33

400

5,236 + 6523 = 

11,759

400
I am like a square, all sides are the same length. The opposite inside angles are equal. The opposite sides are parallel. 
rhombus
400

12 x 12

144

500

345,678

345,700

500

1,236, 1, 242, 1,248, ______, 1,260, 1,266

1,254

500

435 + 784 + 345 + 100 + 200 = 

1,864

500

I have a rounded slightly elongated outline or shape like an egg. 

Oval

500
100 x 1,000 = 

100,000