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
How many tens are there in 4,596
9
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 647
637
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
Write the number in standard form: 5,000 + 400 + 5
5,405
What is the value of the 8 in the number 8,923
8,000 or 8 thousands