Multiplication•Grade 3•Mixed Review

Multiplying by Multiples of 10 — Grade 3 Practice

Practice multiplying one-digit whole numbers by multiples of 10 from 10 to 90 using place value strategies to find products quickly and accurately.

CCSSAligned to Common Core 3.NBT.3: Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80) using strategies based on place value.

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Three different problem sets — same skill, same layout, fresh numbers.

Preview — Set A

Multiply each one-digit number by a multiple of 10 and write the product.

1.
3 × 10 =
2.
5 × 20 =
3.
2 × 40 =
4.
7 × 30 =
5.
4 × 50 =
6.
6 × 60 =
7.
9 × 80 =
8.
8 × 70 =
9.
1 × 90 =
10.
5 × 60 =
11.
3 × 80 =
12.
7 × 50 =
13.
6 × 40 =
14.
4 × 70 =
15.
9 × 30 =
16.
2 × 90 =
17.
8 × 20 =
18.
6 × 70 =
19.
5 × 80 =
20.
7 × 90 =

Other ways to solve this

Using 3 × 10 from this sheet (Set A, problem 1). Each method below reaches the same answer, 30, by a different route; pick the one that makes the most sense to you.

Equal groups

Helps when multiplication is new: it shows what the two numbers mean.

Step 1Make 3 groups with 10 in each group. That is 3 rows of 10.
Step 2Add the groups: 10 + 10 + 10 = 30.
- 10 + 10 + 10 = 30
Step 3So 3 × 10 = 30.

Step 1 of 3

Skip counting

Helps with the times tables: say the multiples in order and stop at the right one.

Step 1Count by 10s, 3 times.
- 10, 20, 30
Step 2The 3rd number you say is 30.
Step 3So 3 × 10 = 30.

Step 1 of 3

What this worksheet covers

Twenty multiplication problems fill this mixed review page; problem 7 asks "9 × 80", and the sheet stays at that level throughout. What makes this set particular: the numbers run as high as 90. Further down, problem 14 asks "4 × 70". It is written against Common Core 3.NBT.3 — Number & Operations in Base Ten, grade 3.

Skills practiced

Grade 3 multiplication means multiplication facts to 10 × 10 and 12 × 12, and multiplying by multiples of ten. The skill on the page: multiplying by Multiples of 10. Working the page asks a student to recall the multiplication facts quickly and accurately, without counting up to them. Nineteen different answers appear across the twenty problems, so a student cannot copy one result down the page.

About the mixed review format

The 20 problems are deliberately assorted — problem 7, "9 × 80" is followed by something of another shape — so the student has to read each one rather than run the last method again. Mixing facts, multiples of ten and larger products on one page keeps a student choosing a method instead of repeating one.

Set A, Set B and Set C

Set A is the original sheet, and Sets B and C were derived from it problem by problem: each number became a slot redrawn with the same shape, and every answer was recomputed exactly. Where Set A's problem 11 is "3 × 80", Set B's is "4 × 20".

How to use this worksheet

Give this mixed review uninterrupted. At grade 3, multiplication is where procedure and recall have to run at the same time, and twenty problems done in fragments hide which of the two is the problem. Mark the twenty problems the same day using the key — an error caught immediately is a correction, and one caught next week is a habit.

One mistake to watch for

Zeros are lost when multiplying by multiples of ten: 6 × 40 is answered 24 instead of 240. Watch problem 17 of this mixed review — "8 × 20" — for this one.

The fact 6 × 4 is recalled and the ten is forgotten.

Rewrite 6 × 40 as 6 × 4 × 10 for a few days so the ten is a visible factor rather than a decoration.

The full guide to teaching multiplicationTeaching multiplication from equal groups to integer exponents: the grade 2–8 progression, times-table strategies, and the errors that stall students.