True or False
The sum of 2 and 3 is the same as the sum of 3 and 2.
True
Use number bonds to add by making a ten:
7+6
6 = 3+3 ; 7+3 = 10 ; 10+3= 13
Use a mental math strategy to add 27 and 62
Various responses to get answer 89
Ex: Add tens and then ones
Give three to 27 and get 30+59
312+65=
377
Eric sold 1,950 boxes of muffins during the school fair. Clara sold 1,520 more boxes of muffins than Eric. How many boxes of muffins did they sell in all?
1,950+1,520 = 3,470 ( Clara)
3,470 + 1,950 = 5,420 in all.
The sum of 4 and 5 is the same as the sum of 1 and 8.
True
Use number bonds to add by first making a ten.
7+5=
5= 3+2 ; 7+3 = 10; 10+2 = 12
133
Add tens then ones
Add 3 to 47 - 50+86 = 136 - then subtract 3 ones
529+136=
665
Tiana bought a sandwich for $17.99 and a glass of juice for $5.60. She spent another $10.25 on a waffle. How much did she spend in all?
$17.99+$5.60+$10.25 = $23.60 + $10.24 = $33.84
The sum of any number and 0 is always 0.
False! A number plus 0 is equal to the number you began with. 5 + 0 = 5
Use number bonds to add by first making a ten
4+8+2
8+2 = 10 ; 10+4 = 14
Use a mental math strategy to add 36 + 96
Various answers - 132
Add 4 to 96 to get 100+36
136-4 = 132
9,008 + 575 =
9,583
Gabriel folded 253 paper cranes. Martin folded 174 more paper cranes than Gabriel. How many paper cranes did Martin fold?
427
The sum of two even numbers is always odd.
False! It is always even!
Use number bonds to add by first making a ten
6+1+4
6+4 = 10 ; 10+1 = 11
Use a mental math strategy to add 94 and 98
192
Add 2 to 98 - 100+94 = 194
194-2 = 192
1,078+867 =
1,945
Sean saved $39. Mya saved $17.95 more than Sean.
How much did they save in all?
$39+$17.95 = $56.95
$39 + $56.95 = $95.95
The sum of two odd numbers is always even.
True!
Use number bonds to add by first making a ten
7+6+3 =
7+3 = 10; 10+6=16
Use mental math strategy to add 46 and 47
93
47+3 = 50 , 50+46 = 96 ; 96-3 = 93
7,685+1,883=
9,568
Ms. Myers bought a bunch of bananas for $3.89 and some mangoes for $5.25. She had $16.52 left. How much did the bananas and mangoes cost? How much money did she have to start with?
$5.25 + $3.89 = $9.14
$16.52 + $9.14 = $25.66