Wyoming Math 4.NBT.5b
The Standard
Use strategies based on place value and the properties of multiplication to: Multiply a pair of two-digit numbers.
2023 Wyoming Mathematics Content and Performance Standards · Use place value understanding and properties of operations to perform multi-digit arithmetic (limited to whole numbers less than or equal to 1,000,000).
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students split two-digit numbers into tens and ones. They multiply the parts, add the partial products, and show their work with an area model or equations.
What Mastery Looks Like
- For 23 × 14, a student finds 200, 80, 30, and 12, then adds them to get 322. They can explain where each partial product comes from.
Common Misconceptions
- Students may treat the 2 in 23 as 2 instead of 20. They may leave out a partial product or add 4 instead of multiplying by 4 when splitting 14.
How to Assess It
- Exit ticket: Find 34 × 12 by splitting both numbers into tens and ones. Show all four partial products and their sum.
Lesson moves
Ways to Teach It
On grid paper, draw a 23 by 14 rectangle, split each side into tens and ones, and label the four products.
Have partners sketch and explain why 26 × 13 equals 26 × 10 plus 26 × 3.
Give pairs two-digit number cards to multiply using partial products, then have them check each other's sums with an area model.
Post an order for 18 boxes of 24 pencils and ask students to find the total by splitting 18 into 10 and 8.
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Printable 4.NBT.5b Worksheet
A ready-to-print activity worksheet aligned to 4.NBT.5b, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 1.NBT.4b
Adding a two-digit number and a multiple of 10.
- 1.NBT.4c
Understand that in adding two-digit numbers, adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
- 1.NBT.4a
Including adding a two-digit number and a one-digit number.
- 4.NBT.5a
Multiply a whole number of up to four digits by a one-digit whole number.
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