Five pages on multiplying whole numbers by 10, 100 and 1,000, with no division. Page 1 puts numbers in a place value chart up to the hundred thousands: students write each digit in its new place and draw arrows to show that every digit moves one place to the left for each 10, then finish sentences such as "80 is 10 times as much as 8". Page 2 follows one number through × 10, × 100 and × 1,000 (46, 460, 4,600, 46,000), counts the zeros at the end of both numbers before multiplying (50 × 100 has 1 + 2 = 3 zeros, so it is 5,000), and multiplies by 100 as times 10, then times 10 again. Page 3 is 24 products, some written the other way round (1,000 × 26), then six comparisons with >, < or =. Page 4 has missing numbers such as □ × 100 = 4,500 and 27 × □ = 27,000, four answers to check and fix, and products to circle that match a number. Page 5 has six short stories that change meters to centimeters, kilometers to meters, kilograms to grams and liters to milliliters, and count $10 and $100 bills. Every page starts with a worked example.
Write 32 in a place value chart on the board and ask a student to multiply it by 100 by moving the digits, not by adding zeros. Ask what the 3 is worth now, and why a 0 fills the tens and the ones. Before page 2, count aloud as a class: 46, 460, 4,600, 46,000. Then write 50 × 100 and ask how many zeros the product has; some will say two. On page 4, talk through the mistakes together: which zero did each person forget, or add?
Count play money in $10 and $100 bills: 7 bills of $10 is $70, so 7 bills of $100 is $700. Read kitchen labels in liters and milliliters or kilograms and grams, and ask how many milliliters are in 2 liters. Have your child say how many places each digit moves before writing the answer.
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
Multiplying whole numbers by 10, 100 and 1,000 with place value and patterns of zeros. Students move digits in a place value chart, count the zeros, practice products, find missing numbers and mistakes, and solve stories with metric units and money.
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