To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation.

Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

Maths

In this unit pupils will multiply a 2-digit number by a single-digit number using partitioning and representations using expanded multiplication and using short multiplication. In the future unit pupils will multiply a 3-digit number by a single-digit number using expanded and short multiplication.

In the prior unit pupils explained the relationship between multiplying and dividing a number by 10 and multiples of 10. In this unit pupils will multiply a 2-digit number by a single-digit number using partitioning and representations using expanded multiplication and using short multiplication.

Multiplication by partitioning leading to short multiplication (2 by 1-digit)

To estimate for the calculation: 4 × 72, 72 is between __________.

Select the correct number to complete the estimation.

Write the correct number to complete the estimation.

Select an appropriate estimation for 63 × 3

Use estimation to decide which has a suitable answer for this multiplication: 46 × 3

Solve the worded problem using short multiplication: In one month 34 cups of lemonade are sold. The following month, six times as many are sold. How many cups of lemonade were sold that month?

Izzy is chanting her 7 times tables: ... 21, 28, 35, ___. What comes next?

Izzy is chanting her 7 times tables in descending order: ... 77, 70, 63, {{ }} . What comes next?

Use short multiplication to calculate this question: 56 × 3 = {{  }}

Use expanded multiplication to calculate this question: 74 × 5= {{  }}

Sam has 71 shiny cards, Izzy has 213 shiny cards. Izzy has {{  }} times as many. 

This lesson will soon be taken down.

Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

Lesson outcome