Grade 2. Lesson 33.

Calculate

100

If 845-323=522, then

845-325=...

520

200

If 845-323=522, then

847-323=...

524

300

If 845-323=522, then

843-323=...

520

400

If 845-323=522, then

846-323=...

523

500

If 845-323=522, then

846-322=...

524

My rule is Y=X+15

100

if X=28, what is Y ?

Y=43

200

if Y=28, what is X ?

28=X+15

X=13

300

if X=35, what is Y ?

Y=35+15

Y=50

400

if Y=35, what is X ?

35=X+15

X=20

500

if X=100, what is Y ?

Y=100+15

Y=115

Equations

100

22 + X + X + 45 = X + 100

X = 33

200

X + 65 = X + X + 48

x=17

300

15+x=84-24

x=45

400

X+10+X=70

X=30

500

25=75-2X

X=25

Find

100

What is half of 24?

12

200

What is a third of 24?

8

300

What is a quarter of 24?

6

400

What is a sixth of 24?

4

500

What is a third of 18?

6

Smart calculation

100

How many cuts are needed to cut a stick into 6 parts? 

5 cuts

200

How many cuts are needed to cut two sticks into 6 parts?

4 cuts

300

How many cuts are needed to cut 7 sticks into 11 parts?

4 cuts

400

How many cuts are needed to cut N sticks into M parts?

M-N cuts

500

How many sticks were cut into 8 parts using only 5 cuts?

3 sticks