integers
place value
order of operations
history of number
number patterns
100

100+12

112

100

place value of the 6 in 16?

units

100

100+(7 times 2)=

114

100

IV=

4

100

2,4,?

6

200

2 times 4

8

200

place value of the 3 in 132?

tens

200

12+(4-2)=

14

200

IX=

9

200

7,14,?

21

300

12 times 3

36

300

place value of the 7 in 1720?

hundreds

300

(1+7)times 3=

24

300

XL=

40

300

6,13,20,?

27

400

72 divided by 2

36

400

place value of the 3 in 12.3?

tenths

400

2 times 12-7=

17

400

D=

500

400

68,7,9,8,?

10

500

1112+792

1804

500

place value of the 5 in 72.54?

hundredths

500

14+2+(7 times 2)=

40

500

LX=

60

500

2,4,9,16,?

25

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