Words to Know
Friendly Number
Numbers that end in a zero.
What tells you to round DOWN?
23
20
121
100
What is the sum of 579 and 693?
1,272
What is another word for Round?
Estimate
What tells you to round UP?
Numbers 5-9
81
80
687
700
What is the difference of 890 and 549?
341
What does SUM mean?
To Add
Does 56 round UP or DOWN? To the nearest TEN
UP to 60
165
170
423
400
What is the ROUNDED sum of 643 and 125? (nearest TEN)
768 is 770
To Subtract
Does 43 round UP or DOWN? To the nearest TEN
Down to 40
233
230
1,512
1,500
722 is 700
What does ABOUT mean?
To Round or Estimate
Does 136 round UP or DOWN? To the nearest HUNDRED
Down to 100
446
450
3,986
4,000
About how much is 1345+543 to the nearest HUNDRED?
1,888 is 1,900