Let us count the number of wheels in tricycles. Number of wheels in 10 tricycles with 3 wheels in each is wheels = ____ wheels. Number of wheels in 10 more tricycles with 3 wheels in each is wheels = ____ wheels. Number of wheels in 20 tricycles with 3 wheels in each is wheels = ____ + ____ = ____ wheels.
Number of wheels in 10 tricycles = 30 wheels. Number of wheels in 10 more tricycles = 30 wheels. Number of wheels in 20 tricycles = 30 + 30 = 60 wheels. = 30. = 60.
Explanation
The chapter introduces multiplication with multiples of 10. For 10 tricycles with 3 wheels each: = 30 wheels. For 20 tricycles: = (10 + 10) × 3 = 30 + 30 = 60 wheels. This shows that = 60, which is double of = 30.
Solution Steps
Step 1: 10 tricycles × 3 wheels = 30 wheels
Step 2: 10 more tricycles × 3 wheels = 30 wheels
Step 3: 20 tricycles = 10 + 10 tricycles
Step 4: = 30 + 30 = 60 wheels