Mental Math!
Solve in more than 1 way: 43 + 37
80
Slide 7 to make 50 + 30 = 80
Slide 3 to make 40 + 40 = 80
Tens, ones 70 + 10 = 80
Round then subtract 43 + 40 = 83, 83 - 3 = 80
Write the greater number on your board. 7,865 or 8,567
8,567
Complete the pattern: 4,024, 4,034, 4,044, 4,054, _______
4,064
Write the number in words. 2431
Two thousand, four hundred thirty-one
What is the value of the digit 3 in 1,038
30 or 3 tens
61
Slide 1 to make 40 + 21 = 61
Slide 8 to make 31 + 30 = 61
Tens, ones 50 + 11 = 61
Round then subtract 40 + 22 = 62, 62 - 1 = 61
Write the smaller number on your board. 4,104 or 4,049
4,049
Complete the pattern: 994, 995, 996, 997, ______
998
Write the number in expanded form: 1,736
1,000 + 700 + 30 + 6
What is the value of the 9 in 4,596?
9 tens or 90
123 + 222
345
Add hundreds, tens, ones
Arrange these number in order from least to greatest. 6,400 6,380 6,523 5,236
5,236 -- 6,380 -- 6,400 -- 6,523
_________ is 10 less than 607
597
Write the following number in standard form: four thousand, two hundred ninety-one
4,291
In 5,619 the digit 6 is in the ___________ place.
hundreds
45 + 99
Explain thinking.
144
Slide one to make 100. 44 + 100 = 144
Round, then subtract. 45 + 100 = 145, 145 - 1 = 144.
What is the greatest 4-digit number you can make with these digits: 5, 0, 9, 9
9,950
______ is 100 less than 945
845
Write the number in expanded form: 7,504
7,000 + 500 + 4
in 4,502 the digit 2 is in the ________ place
ones
56 + 97
Explain thinking.
153
Slide 3 to make 100. 53 + 100 = 153
Round then subtract 3. 56 + 100 = 156, 156 - 3 = 153.
Write the smallest number you can make with these digits. 8, 5, 6, 2
2,568
Complete the pattern: ________, 1,300, 1,301, 1,302
1,299
I have 5 thousands 33 tens 12 ones.
What number am I?
5000 + 330 + 12
5342
I am a 4 digit number. All of my digits are odd numbers. Each is used only once. The value of my thousand digit is 9000. The sum of my tens and and ones digits is 10. The sum of my hundreds and tens digits is 8.
9537
3 + 7 = 10
5 + 3 = 8