Level 1
Find the value of 1 unit.
  1. 1 u + 5 = 10
  2. 5 + 1 u = 10
  3. 10 = 1 u - 5
  4. 10 = 5 + 1 u
4 m
Level 1
Find the value of 1 unit.
  1. 1 u - 5 = 10
  2. 10 = 1 u - 5
  3. 10 - 1 = 1 u - 5
  4. 10 + 1 = 1 u - 5
4 m
Level 1
Find the value of 1 unit.
  1. 3 u + 20 = 50
  2. 20 + 3 u = 50
  3. 5 u - 20 = 30
  4. 30 = 5 u - 20
4 m
Level 1
Find the value of 1 unit.
  1. 5 u - 20 = 10
  2. 5 u - 20 = 1 u
  3. 10 = 5 u - 20
  4. 1 u = 5 u - 20
4 m
Level 1
Find the value of 1 unit.
  1. 5 u + 8 = 1 u + 20
  2. 1 u + 20 = 5 u + 8
  3. 5 u - 20 = 1 u + 4
  4. 1 u + 4 = 5 u - 20
4 m
Level 2
Find the value of 1 unit.
  1. 1 u + 8 = 20 - 5 u
  2. 20 - 5 u = 1 u + 8
  3. 1 u - 10 = 20 - 5 u
  4. 20 - 5 u = 1 u - 10
4 m
Level 2
Find the value of 1 unit.
  1. 5 u - 20 = 1 u - 8
  2. 1 u - 8 = 5 u - 20
  3. 8 - 1 u = 20 - 5 u
  4. 20 - 5 u = 8 - 1 u
4 m
Level 2
Find the value of 1 unit.
  1. 6 u - 15 = 1 - 2 u
  2. 1 - 2 u = 6 u - 15
  3. 5 u - 2 = 14 - 3 u
  4. 14 - 3 u = 5 u - 2
4 m
Level 2
Find the value of 1 unit.
  1. 7 u - 20 = 4 u + 10
  2. 4 u + 10 = 7 u - 20
  3. 4 u - 10 = 1 u + 20
  4. 1 u + 20 = 4 u - 10
4 m
Level 3
Some stickers are packed into exactly packets of 10.
If the stickers are repacked into packets of 7,
there are 3 more packets.
  1. How many packets of 7 are there?
  2. How many stickers are there?
3 m
Level 3
Some stickers are packed into exactly packets of 7.
If the stickers are repacked into packets of 10,
there are 3 less packets.
  1. How many packets are there?
  2. How many stickers are there?
3 m
Level 3
Some stickers are packed into exactly packets of 10.
If the stickers are repacked into packets of 7,
there are 4 more packets and 2 stickers left.
  1. How many packets are there?
  2. How many stickers are there?
3 m
Level 3
Some stickers are packed into exactly packets of 7.
If the stickers are repacked into packets of 10,
there are 4 less packets and 2 stickers extra.
  1. How many packets are there?
  2. How many stickers are there?
3 m
Level 3
Some stickers are packed into exactly packets of 7.
If the stickers are repacked into packets of 10,
there are 4 less packets and needs 6 more stickers to make another packet.
  1. How many packets are there?
  2. How many stickers are there?
3 m
Level 3
12 of the number is 30 less than twice of the number.
Find the number.
2 m
Level 3
Twice a number is 45 more than 34 of the number.
Find the number.
2 m
Level 2
The average cost of three books is $30.
Two of the books cost $10 and $20.
What is the cost of the 3rd book?
2 m
Level 3
The average cost of some books is $75.
When another 3 books are added,
the total cost increases by $190.
The average cost becomes $70.
How many books are there in the end?
3 m
Level 2
There were 40 more dresses than blouses in a shop. After 70 dresses and 30% of the blouses were sold, there were an equal number of dresses and blouses left. How many blouses were there in the shop at first?
2 m
Level 3
The average cost of some books is $30.
When a book that costs $90 is added,
the average cost of the books becomes $40.
How many books are there in the end?
3 m