Fishtank Learning
4th Grade Math
Unit 2: Multi-Digit Multiplication
Lesson 12
Objective
Multiply two-digit multiples of 10 by two-digit numbers.
Anchor Tasks - Problem 1
Two different students solved the problem 40 × 22 below. Explain what each student did and whether the strategy they used works.
| Student A
|
Student B
|
Anchor Tasks - Problem 2
Estimate each product. Then use any method to find the product.
a. 60 × 31
b. 18 × 70
c. 90 × 56
d. 35 × 80
Problem Set
Target Task - Problem 1
Which of these expressions can be used to find the product $$20\times41$$? Select the two correct answers.
A. $$41 \times 10 + 2$$
B. $$41 \times 2 \times 10$$
C. $$(40+20)\times(1+20)$$
D. $$20\times40+1$$
E. $$41\times2\times10$$
F. $$(20\times40)+(20\times1)$$
Target Task - Problem 2
Solve. Show or explain your work.
$$32\times60$$
Word Problem
A painter wants to use a very unique canvas. This special canvas measures 8 inches wide by 114 inches long. What is the area of the canvas?