Subtract multiples of ten from 2-digit numbers
I can use number facts to subtract multiples of ten from a two-digit number.
Subtract multiples of ten from 2-digit numbers
I can use number facts to subtract multiples of ten from a two-digit number.
Lesson details
Key learning points
- When subtracting multiples of ten from a two-digit number, the tens digit changes but the ones digit stays the same.
- We can use number facts to help us subtract multiples of ten from a two-digit number.
Keywords
Multiples of ten - The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.
Recombine - To add the parts of a number gained through partitioning the whole to reach the whole again.
Common misconception
Children may automatically count back in tens to subtract a multiple of ten.
Discuss efficiency and compare different methods. Use practical equipment to draw attention to the relationship between adding multiples of ten in two-digit numbers and the known facts they already possess.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.19 + 40 = ? How many tens is being added to 19 in this equation? tens
Q2.Look at the image. Which equation does it represent?
Q3.Match the known facts that will help to add multiples of 10
2 tens + 4 tens = 6 tens
50 + 30 = 80
40 + 50 = 90
Q4.What could we do to help solve this equation? 32 + 50 =
Q5.Which of these equations will have the same sum as 54 + 40 = ?
Q6.33 + 40 =
Assessment exit quiz
6 Questions
Q1.Look at the number line. What equation is it showing?
Q2. 86 − 50 = ? How many tens are being subtracted from 86 in this equation? tens
Q3.Which of the images represent this equation? 82 − 40 =
Q4.Match the known facts that will help to subtract multiples of 10
5 tens − 2 tens = 3 tens
80 − 60 = 20
90 − 40 = 50
Q5.What could we do to help solve this equation? 75 − 30 =
