Mental Math with 10, 100, 1,000 and Tenths
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Mental Math with 10, 100, 1,000 and Tenths
Mental math worksheet for Grade 4: sixteen facts such as 46 × 100, 420 ÷ 10, 3.4 + 0.5 and 6.2 − 1.7, multiplying by 10, 100 and 1,000, dividing by 10, and adding and subtracting tenths. With an answer key.
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- Pages
- 1
- Last updated
- Time
- About 10 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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See that each place is 10 times the place to its right, write powers of 10 with exponents, and multiply and divide whole numbers and decimals by 10, 100 and 1,000 by moving digits.
Reviewed by Mrs. Catherine Reynolds, Teacher. How we check worksheets
How to use this sheet
- Have the child write a few products as a pattern first: 3 × 10, 3 × 100, 3 × 1,000.
- Use a place value chart and move the digits, rather than "adding zeros", so the rule also works for decimals.
- For exponents, have the child count the zeros of 10 raised to a power and match them to the exponent.
Common mistakes
- Saying multiplying by 10 "adds a zero", which breaks for 0.3 × 10. Each digit moves one place left instead.
- Moving the digits the wrong way when dividing by a power of ten. Dividing makes the number smaller.
- Reading 10 to the power 4 as 10 × 4. It is four tens multiplied: 10 × 10 × 10 × 10.
