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GRADE 3 / PLACE VALUE

Multiply by
multiples of 10.

Use a familiar multiplication fact to count tens. Start with ten-rods and six guided problems, then practise 27 products with whole tens from 10 to 90.

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From groups to tens

Think in tensNUMBERLEAF / PLACE VALUEThink in tensName __________________________ Date ______________Worked example3 × 20 means 3 groups of 2 tens.Each rod below is one ten.2 tens2 tens2 tens3 × 2 tens = 6 tens = 60.Write the number of tens, then write its value.1. 6 × 206 × ____ tens = ____ tens____ tens = ________2. 4 × 304 × ____ tens = ____ tens____ tens = ________3. 4 × 404 × ____ tens = ____ tens____ tens = ________4. 8 × 508 × ____ tens = ____ tens____ tens = ________5. 8 × 708 × ____ tens = ____ tens____ tens = ________6. 4 × 904 × ____ tens = ____ tens____ tens = ________Sam got 6 for 2 × 30. What did Sam count? Give the product.numberleafmath.com · guidedEdition 0IJV6PF
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TEACHER & FAMILY NOTES

What does
24 count?

Work through 6 × 40

Forty is four tens. Six groups of four tens make 24 tens. Each ten is worth ten ones, so 6 × 40 = 240. In symbols, 6 × (4 × 10) = (6 × 4) × 10. Ask the learner to name the unit after saying “24.”

If the learner answers 24

Keep the basic fact they already know. Ask, “Did you count 24 ones or 24 tens?” Ten-rods can make the distinction visible. For 3 × 20, put two rods in each of three groups. The six rods are worth 60 ones. The guided page shows this model.

When to move to independent practice

Cover the model and try 5 × 60. Listen for the unit in “30 tens,” then ask how many ones that represents. If the learner can explain 300 using the groups, use the independent page. To check one printed question together, open Try a question from this page below the preview. The question numbers follow the paper.

What this set covers

The independent sheet uses each multiple of ten from 10 through 90 three times. One question asks about zero groups and one about a single group. The lesson addresses the place-value strategy in Common Core 3.NBT.A.3. If the basic facts need work first, choose a focused times-table sheet. Next, use area models and partial products for numbers such as 24 × 6.

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